Mailing Bags

Our Range of Mailing Bags

Polythene Mailing Bags – Recycled grey poly bags in 11 sizes

Kraft Mailing Bags – Plastic free paper mailing bags in 6 sizes

Padded Envelopes – Bubble lined or padded bags for fragile and delicate items

Documents Enclosed Wallets – Self-adhesive wallets for attaching paperwork to parcels

Grip Seal Bags – Clear resealable bags for small items and components

Polythene Mailing Bags

Our Polythene Mailing Bags are grey postal bags made from 100% recycled polythene that would otherwise have ended up in landfill. They are lightweight, waterproof, tear resistant and available in 11 sizes from 4.5 x 7 inches (114 x 178mm) up to 28 x 30 inches (711 x 762mm). Each bag features a peel and seal closure for quick, secure sealing.

Polythene mailing bags are the most popular and economical option for posting non-fragile items such as clothing, textiles, soft goods and documents. They are significantly lighter than postal boxes, which helps to keep postage costs down, and their flexible construction means they conform to the shape of the contents, reducing wasted space. They are also 100% recyclable.

Kraft Paper Mailing Bags

Our Kraft Mailing Bags are the plastic free alternative to traditional polythene postage bags. Made from single ply 120gsm brown Kraft paper, they are sturdy, durable and water resistant. They are available in 6 sizes and are 100% recycled, biodegradable, compostable and recyclable with normal household recycling.

Paper mailing bags are increasingly popular with e-commerce businesses that want to reduce their use of plastic packaging. They offer a professional, natural look and are well suited to clothing, accessories, stationery and other non-fragile items. For businesses where sustainability is a key part of the brand, Kraft mailing bags send a clear message to customers.

Padded Envelopes

For items that need cushioned protection during transit, our Padded Envelopes provide a built-in layer of bubble wrap padding inside a paper envelope. They are available in sizes A through to K, in both gold and white, and are ideal for posting fragile items such as jewellery, cosmetics, electronics, books and craft supplies.

We also offer Eco Padded Envelopes from Enviroflute, which provide the same level of cushioned protection but are fully recyclable, biodegradable, plastic free and water resistant.

Documents Enclosed Wallets

Our Documents Enclosed Wallets are self-adhesive polythene pouches that attach to the outside of a parcel, holding delivery notes, invoices, packing slips or customs documentation securely in place. They are available in A5/C5 and A7/C7 sizes, in both plain and printed versions with the words “Documents Enclosed” clearly displayed.

Documents enclosed wallets are a standard requirement for businesses that ship goods regularly, ensuring that the correct paperwork accompanies every parcel without the risk of it being separated or damaged during transit.

Grip Seal Bags

Our Grip Seal Bags are clear, resealable polythene bags with a press-close seal. Made from 160-gauge (40 micron) LDPE, they are available in a range of sizes and are ideal for keeping small items clean, dry and organised. They are commonly used for packaging jewellery, cosmetics, craft components, screws, bolts and other small parts.

Grip seal bags are reusable and resealable, making them a practical choice for items that need to be accessed and resealed multiple times, or for bundling small items together within a larger parcel.

Choosing the Right Mailing Bag

Choosing the right mailing bag depends on what you are sending, how much protection it needs and whether sustainability is a priority. As a general guide:

Polythene mailing bags are the most economical option for non-fragile items. They are waterproof, lightweight and available in the widest range of sizes. Choose these for clothing, textiles, soft goods and general e-commerce despatch where the items do not need cushioning or rigidity.

Kraft paper mailing bags offer the same practical benefits as polythene bags but without the use of plastic. Choose these when sustainability is important to your business or your customers, or when you want your packaging to have a more natural, premium feel.

Padded envelopes are the right choice for smaller fragile items that need cushioning against bumps and drops during transit. They combine the convenience of a mailing bag with built-in bubble wrap protection, making them ideal for jewellery, cosmetics, electronics and other delicate products.

Documents enclosed wallets are not mailing bags in the traditional sense, but they are an essential accessory for any business that ships parcels. They ensure that delivery notes and invoices travel securely with the package.

Grip seal bags are best for organising, protecting and presenting small items. Use them inside a mailing bag or postal box to keep components together or to add a layer of protection against moisture and dust.

Mailing Bags for E-Commerce Businesses

Mailing bags are one of the most popular packaging choices for e-commerce businesses. They are lighter and more compact than postal boxes, which keeps shipping costs down and reduces storage space in your packing area. For businesses despatching through Royal Mail, all of our mailing bags are sized to work with the Pricing in Proportion (PiP) guidelines, so you can choose the right size without overpaying on postage.

For high volume despatch, our polythene mailing bags are packed in boxes of 500 or 1,000, making them practical for busy fulfilment operations. We offer competitive bulk pricing across the full range, with further discounts available on larger orders.

Sustainable Mailing Bag Options

Sustainability matters, and we offer eco-friendly alternatives across the range. Our polythene mailing bags are made from 100% recycled material and are fully recyclable. Our Kraft paper mailing bags go further: they are plastic free, biodegradable, compostable and recyclable in standard household paper recycling. For cushioned protection without plastic, our Enviroflute eco padded envelopes are fully recyclable and made entirely from sustainable materials.

Whichever option you choose, you can be confident that Forms Plus prioritise responsible sourcing and offer practical ways to reduce the environmental impact of your packaging.

Why Buy Mailing Bags from Forms Plus?

Forms Plus have supported businesses with their printing and packaging requirements since 1981. We stock mailing bags across the full range of types and sizes, with most lines available for same day despatch. Our pricing is competitive and transparent, with further discounts available on larger orders.

We also stock a full range of complementary packaging products, including Envelopes, Postal Boxes, Packing Tape and Labels, so you can consolidate your packaging supplies in one order.

Request a Free Sample or Contact Our Team  if you would like help choosing the right mailing bag for your needs.