Sealing & resealing bags

Buy from an extensive range of sealable and resealable bags, including grip seal bags, zip seal bags and self-seal bags.

Sealing and resealing bags are...

• Reusable polythene bags that can be opened and closed
• Designed for multiple use - open and close as many time as you like!
• Bags that can be sealed by a variety of means, including self-seal bags

Self-seal bags are...

• Manufactured with an integral sealing strip, located along the bag opening, to allow for easy opening and closure
• Also known as minigrip bags, mini-grip bags, gripper bags, grippa bags and resealable bags
• Ideal for securing bag contents and avoiding leakage or contamination
• Available in a variety styles to suit a range of uses, from storage bags to carrier bags
• Available in clear polythene with or without labels - to make a note of bag contents and help retrieval
• Available in variety of coloured opaque polythene - e.g. red, green, blue or black - to help with item storage and colour-coded retrieval
• Also available in more specialist polythene, from heavy duty grip seal bags to anti-static grip seal bags
• Sometimes referred to as zip seal bags. However…

Popular views on mail bags

Courier bags need the proper film balance if they are going to keep safe products without becoming awkward in use. A bag that is also thin can split in transit, while one that is also heavy adds cost and waste without giving better protection. For dispatch teams, the proper test is how the bag behaves when packed fast, sealed, and stacked with other consignments. Film selection also affects puncture resistance, print quality, and how neatly the bag feeds through packing lines. When the specification matches the job, handling damage drops and packing runs stay smoother.

Mailorder bags need to behave predictably at the packing bench, because any film that fights the operatour fast drags down output. A bag that opens flat, stays open long enough to load, and feeds cleanly from the stack cuts out additional handling and retains the pace moving when order volumes are climbing. If the polymer is also soft, it can cling and fold back on itself; if it is also stiff, it resists opening and makes sealing slower. Consistent gauge and slip let the line dash at a proper rhythm, which is far better than stopping to proper all awkward bag.

Grey Mailing Bags Strong Poly Postal Postage Post Mail Self Seal All Sizes Cheap Grey Mailing - £151.99

Mailing bags need to balance low cost with enough strength to survive the trip through sorting centres, delivery vehicles, and a busy receiving dock. A cost-effective bag that tears at the gusset or splits at the seal line fast creates handling damage, returns, and wasted labour, so gauge and seal quality matter above the headline price. Grey polythene suppliers mailers are often chosen because they conceal scuffs and give decent puncture resistance without adding unnecessary weight. Picking the proper size also assists, since an oversised bag shifts around in transit and an undersised one stresses the seam. A mail bag that matches the load properly normally gives better protection and less complaints.

Grey polythene suppliers Mailers

Blue polythene suppliers mailers earn their place on busy packing lines because they are light, fast to use and still give enough protection for small consignments. The colour makes them easy to spot at the select-face, so alternative stock routes are less likely to be mixed up when operatours are working fast. That small visual cue can save a surprising amount of checking, particularly where several bag sizes or order types are handled in the same area. Practical handling matters as much as appearance, though, because a mailer that fits the task assists despatch dash smoothly and retains the flow of packed products moving.

Plastic mailing bags manufactured from polyolefin or polyethylene retain products light in transit while still giving decent protection against damp and rough handling. That matters when fat items need to transport cheaply, because all additional gramme adds cost across a consignment and can affect dispatch efficiency. A well-manufactured bag grasps its shape, resists punctures from corners and edges, and will not split easily in cool store or winter transport conditions. The proper gauge also assists the bag retain its integrity without feeling overbuilt. That balance between low weight and proper protection is what makes these mailers practical for daily packing lines.

Mail bags have to be loaded so they do not shift, slump or snag amid the dash. A sack that sees fine at the dispatch door can become awkward once it is stacked in a cart, wagon or van, particularly if the load is uneven or the bags are packed also loosely. Handle them as a proper consignment, not as loose clutter, because the weight of one bag can settle against another and make lifting harder at the next stop. Good handling also protects seals, labels and any contents that could be damaged by repeated rubbing. A tidy load saves time, reduces strain and retains the delivery round moving without avoidable delays.

Plastic mailing bags are losing ground because plenty packing operations now care more about waste profile and warehouse handling than about the quickest potential occupy. A paper-based wrap cut from roll stock can mean more labour at the bench, nevertheless it sits flatter in storage, stacks more neatly on pallets and is easier to count through stock rotation than loose mailers piled in a cage. Plastic bags often see light and simple, yet they employ valuable cubic space and can drift through the dispatch area in an untidy method that slows picking. That kind of bulk does not display up in the product itself, nevertheless it shows up fast in warehouse effort and transport efficiency.

Padded mail bags earn their place where a plain polythene suppliers mailer is also flimsy nevertheless a rigid box would waste space and board. Their value lies in the balance between cushioning and control: the contents stay snug, rubbing is small, and light puncture protection is built in without adding much bulk to a consignment. That matters on the packing bench, because mixed orders transport faster when there is less need for additional wrapping or secondary bagging. A superb bag also assists maintain print, small parts and delicate finishes through handling, which reduces complaints and avoidable returns. The proper specification saves space and manages risk without turning the pack into overkill.

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Plastic mail bags work optimal when they are treated as a part of engineered packaging rather than a cost-effective outer wrapper. A superb bag has to survive drops, rubbing on conveyours and the sharp corners of the products inside without splitting or letting the seal fail, so the film build and seal quality matter as much as the finished see. Co-extruded polythene suppliers is often used because alternative layers can do alternative jobs, like giving strength, keeping the bag firm enough for handling and helping it print clearly. When the gauge is controlled properly, packers acquire less line stoppages and less damaged consignments, which saves time on the packing bench and cuts complaint levels later.

Large mail bags work optimal when the load is laid out to stop movement before it beginnings. A rail mail car has to transport heavy sacks, loose letters and smaller parcels at the same time, so the interior requirements a transparent plan rather than only open space. Strong framing retains the body rigid below the weight, while a timber floor gives a steadier surface for lifting and standing amid fast sorting work. Racks and slots grasp sacks upright and retain mixed consignment from sliding into each other. That makes handling quicker and cuts the risk of a heavy bag flattening lighter mail.

Zip seal bags are…

• Manufactured with a metal zip fastener or zip seal, making them…
• A more premium bag than a grip seal bag
• Used for storing important documents, such as art portfolios or school project work
• Ideal for use as a wallet for conference delegates or for exhibition attendees
• Also known as zip bags, ziplite bags or zipper bags

Sealable, resealable and self-sealable - there's more than one way to seal a bag

Sealable bags

Any plastic bag that can be sealed shut can be described as a sealable bag.

The sealing process can be carried out by any means, including a bag tie or clip (e.g. a sandwich bag with a twist tie), an adhesive strip, either external (e.g. sealing any bag with cellotape) or internal (e.g. as with a mailing bag), an internal self-seal strip (e.g. as with a minigrip bag) or by heat sealing with an external sealer (e.g. as with vacuum bags).

So any plastic bag that is designed with a seal can be called a sealable bag. However, not all sealable bags can be called resealable bags.

Resealable bags

Only bags where the seal can be reused can be classified as resealable bags. Some bags, such as mailing bags, feature a single-use seal that can't be reused without tearing open the bag itself and thus rendering it useless. Mailing bags are a very convenient way of sending post - thanks to their integral adhesive seal - but, because their seal is strong enough to keep the mail contents secude until the bag is cut or ripped open by the recipient, then a mailing bag is not a resealable bag, although it is a sealable bag.

Self-seal bags

Not every sealable bag be called a self-seal bag. This monicker is reserved only for bags that can be sealed closed without using any external sealing accessory - including adhesive tape, clips or bag ties - and without the use of a heat sealer to melt the polythene and seal the bag.

The most popular types of resealable bags are grip seal bags. These bags, which are sometimes known as mini-grip bags, gripper bags or grippa bags, feature an integral seal that runs along the top of the bag.

The seal contains a male (single) and female (double) ridge of plastic on opposite sides of the bag opening. When the seal is squeezed gently between thumb and forefinger, the male ridge fits snuggly into the female ridges to close the bag. This seal protects the contents of the bag from moisture, dirt and other external contaminants.

It can be used over and over again, which means the grip seal bag is a sealable bag, a self-seal bag and a resealable bag.

This handy bag is available in a huge range of sizes, made from clear, coloured or black polythene, with or without labels to make handy notes on the bag and with specialist options including antistatic bags - to keep electrical components safe - and specimen bags with accompanying record cards - perfect for hospitals, doctors' surgeries and police stations.

Methods of sealing plastic bags

The most common ways of sealing a polythene bag are by:

Sealing the bag with ties or clips. Fasten any bag shut with a plastic clip or twist shut with a tie. A popular method of sealing food bags for domestic use (e.g. clip a packet of frozen peas shut before placing in freezer, twist a sandwich bag closed for a packed lunch etc.)

Sealing the bag with a built-in adhesive flap. Some bags such as mailing bags are manufactured with a flap opening, where the flap contains a built-in adhesive strip attached along its length. Simply remove the cover from the adhesive and press the flap down to seal.

Sealing the bag with a built-in grip or zip seal. A range of bags are available with an integral strip that seals shut either by squeezing the seal together (grip seal) or pulling closed (zip seal). Very handy for regular use as they can be used over and over, these bags also provide great protection from moisture, dirt etc.

Sealing the bag with a heat sealer. If you really want to seal your bag shut tight this is the method for you. A heat sealer will bond two pieces of plastic when placed together in the sealer and the sealer is closed shut. A one-time seal, this method of sealing bags is popular for vacuum packing food.

Where to buy sealing and resealing bags

Resealable bag manufacturers and suppliers include:

Ziplock Bags
The home of ziplock bags online, this website features everything you need on ziplock, zipper, ziplite, grip seal and all self-seal bags. With a huge range of products at great prices and free delivery within the UK, this is the number one ziplock website out there.
www.ziplockbags.co.uk

Self Seal Bags
Specialists in self-seal bags, this website stocks a huge range of resealable bags from grip seal to mini grip and ziplock to ziplite. Packed with loads of useful information to help you choose the right bag for you, with free delivery to UK addresses.
www.self-seal-bags.co.uk

Plastic Self Seal Bags
Discount Self Seal Bags is the place to go to get resealable plastic bags at discount prices. Also features loads of useful information on self-seal bags, including a handy buying guide to make sure you pick the right sort of resealable bag for you.
www.discountselfsealbags.co.uk

Minigrip Bags
A website loaded with information on minigrip bags - aka grippa bags - and all types of self-sealing bags, with list of the best places to buy them online. Features a useful guide to anti-static self-seal bags, what they are used for and how they work.
www.minigrip-bags.co.uk

Zip Seal Bags
Zip Seal Bags contains loads of great information on zip seal bags and other types of self-seal polythene bags and eco-friendly alternatives. It also features a handy list of online zip seal bag retailers.
www.zipsealbags.co.uk

Antistatic Bags
Antistatic bags is the number one website dedicated to antistatic bags. Containing a wealth of information on antistatic packaging and how it works, along with details of where to buy it at the best possible prices.
www.antistatic-bags.co.uk

Resealable Bags
Resealable-Bags is a division of Polybags Ltd, the UK's number one polythene manufacturer, that specialises in resealable bags. Offering an unrivalled range of resealable bags and other polythene packaging at the best prices online.
www.resealable-bags.co.uk

Advice from the web on mail bags

Black Poly Mailers

Black poly mailers are often chosen when a package requirements to travel light, see tidy, and retain the contents concealed from view. The dark outer layer gives a cleaner stop than a plain transparent bag, while still allowing fast packing on a busy dispatch line. For apparel, documents, or small soft products, they reduce empty space and are easier to handle than flimsy outer wraps. The proper value comes from pairing the proper gauge with the proper load, because a bag that is also thin splits in transit and one that is also heavy wastes material and storage space. A well-manufactured mailer retains packing fast and the consignment presentable proper through to delivery.

Buy Online Printed Plastic Courier Bags | Tamper Proof …

Courier bags need to stop interference before a consignment ever reaches the delivery van. A well-manufactured bag uses polythene suppliers film that resists easy tearing, with a closure that shows if someone has tried to open it and seal it again. That matters in returns handling, confidential paperwork, spare parts, and other items where missing contents can cause blame at the dispatch desk. The film has to balance strength with enough give to survive sorting and transit without splitting at the seams. A weak gauge or poor seal quality turns a simple mailing pack into a handling problem, so proper closure design is where the proper value sits.

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Mailing bags do a straightforward job, nevertheless the material selection determines whether parcels arrive clean and intact or scuffed and split. A polythene suppliers mailer is light and efficient for clothes and other soft products, while a bubble-lined style gives more shock protection for items that can chip or crease in transit. Flat no-bend formats suit books and print matter that must stay uncurled, although the board or stiffener inside requirements to be matched to the product weight. Good seal quality matters as much as the shell itself, because a weak closure can open in sorting or amid repeated handling.

polythene suppliers mailers suit light consignments because they strip out needless secondary packing and retain soft products tightly enclosed. Clothing, textiles and other flexible items sit close to the film, so a finished package takes up less space on a bench, in a tote or on a vehicle tray than a small carton. That saves room in storage and makes select-face work quicker when orders are moving in volume. The proper earn comes from tidy pack presentation and faster handling, not from making the package see clever. A mailer chosen for the job reduces air in the system and assists dispatch stay brisk.

Plastic mailing bags suit light, low-risk products because they retain postage down without adding much bulk. A superb poly mailer gives enough strength for clothing, paper products, accessories, and other non-fragile items, while taking up very small room in storage and on a packing bench. The self-seal strip speeds up secondary packing, so orders can transport through dispatch with less handling and less packing errours. That also assists select-face efficiency, since a compact mailer is easier to grab and present than a box and null occupy. Used properly, they make small-order fulfilment quicker and cheaper without making the pack see careless.

Chapter One Mail Bags Overview

Mail bags have to cope with rough handling, mixed contents and repeated movement through sorting and dispatch, so the proper material selection matters as much as the bag shape. A lightweight bag that saves on freight can fail if the film gauge or seam quality is poor, while a heavier building may be better when parcels are stacked, dragged or pushed across conveyours. In practice, spec changes often come down to how the bag behaves below load, whether the closure grasps, and how much secondary packing is needed to keep safe the contents. That makes mail bags a packaging decision about handling damage as much as capacity.

Recycling A to Z - Plastic mailing bags

Plastic mailing bags should be kept out of normal waste when they are clean and the local recycling scheme accepts soft plastics. A thin polythene suppliers mailer takes up very small room, nevertheless it still has value as recoverable material if it is sorted correctly instead of being mixed with food waste, paper dust and broken board. Despatch areas that separate used mailers from labels, tape and heavier pack waste normally manufacture cleaner recycling loads and less rejected bales. That sort of discipline also makes the workbench tidier and saves time when waste is gathered for assortment.

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White padded mail bags in the 90 x 145 mm size are a practical reply when small items need protection without wasting space or adding much weight. The bubble lining cushions knocks amid picking, packing and transport, while the polythene suppliers outer layer resists tearing and retains the pack looking tidy as it transports through the line. That matters on fast shift work, where operatours need a bag that seals cleanly, stacks neatly and does not grasp on other products in mixed consignments. Spending less material on each pack also assists with volumetric efficiency, so more can fit into a carton or tote before dispatch. A well-manufactured bag retains damage down without slowing the operation.

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Plastic mail bags succeed when the film is robust enough for rough handling nevertheless still light enough to retain dispatch efficient. A superb bag has to survive sortation belts, chute abrasion and the pressure of mixed parcels stacked in cages, so the gauge and seal layer need careful control. If the film is also soft, it snags and deforms at the select face; if it is also stiff, it wastes space and makes packing awkward. The better formats use polythene suppliers blends that retain shape without fighting the seal, which assists the closure tear only when tampered with. That balance cuts handling damage and retains outbound packing moving at speed.

Large mail bags work optimal when they are chosen to suit the load, not only grabbed because they are close to hand. A bag with decent weave and seam strength can take fat or awkward products, nevertheless it still requirements enough body assist if the contents are sharp, uneven or likely to shift once stacked. In a packing area, rough filling can pull dust into the bag mouth, grasp on exposed edges and leave weak points before the consignment has even reached a vehicle. Matching bag size, occupy weight and closure method to the job retains the load easier to transport and less likely to fail below handling.

Research & Resources

For plenty more information on sealing and resealing bags, including the manufacturing process, types of self-seal bags available and their many uses, please visit:

PlasticBags.uk.com: Browse through a huge range of self seal bags websites or, if you are a manufacturer, list your products for free on this online directory specialising in self seal bags and other plastic packaging.

PackagingKnowledge: The UK packaging industry's number one website contains huge amounts of information and in-depth articles on self seal bags.

Goldstork: This free online directory features specially selected information and hand-picked features on a range of self seal bags and resealable bags.

What is static electricity?

Every object in the world - ourselves included - is made of atoms, which are in turn made of protons, neutrons and electrons. While neutrons have no charge, protons are positively charged and electrons are negatively charged.

In normal circumstances, the number of protons and electrons in an atom balance each other out, meaning that atoms have no charge. However, when two items rub together or separate, the electrons contained within these items can move from atom to atom or even from item to item, thus giving the atoms a positive or negative charge.

If the items involved in this situation are made from a material that does not conduct electricity - an insulator - then this charge can not move. The result is static electricity.

How do antistatic self-seal bags work?

If any static electricity comes into contact with an antistatic self-seal bag, rather than pass through the bag and risk damaging the electrical components inside the bag, the electricity passes around the bag and dissipates before it can make contact with the components, thus removing the possibility of damage.