iSOUL Blue Mailing Bags and Parcel Bags – strong, opaque, self-seal postage bags in 6 sizes, sold in packs of 100. Whether you call them mailing bags, parcel bags, postal bags or plastic mailers, these are made from tough 60 micron polythene with a blue outside and black inner lining, keeping contents private and protected from rain and dirt. A smart, professional colour that suits any business – popular with Vinted, eBay, Etsy and Depop sellers and online shops across the UK. Free UK delivery on every order.

Size guide – which parcel bag do I need?

Why sellers choose iSOUL blue parcel bags

• Strong 60 micron film: thick enough to resist tearing in transit, yet light to keep postage costs down.
• Permanent self-seal strip: peel and press – no tape needed. Once sealed the parcel bag can't be opened without tearing, so parcels are tamper-evident.
• Fully opaque: blue outside, black inner lining, so nobody can see what's inside.
• Water and dirt resistant: protects items from rain and grime during delivery.
• Perfect parcel bags for clothes: ideal for posting clothing, accessories and other soft goods that don't need a box.
• Professional look: a clean, neutral blue that suits menswear, kidswear, tech accessories and business orders, and stands out more than plain grey.
• Works with all couriers: Royal Mail, Evri, DPD, Yodel, InPost and Vinted drop-off points.

Frequently asked questions

What's the difference between mailing bags and parcel bags?
None – they're the same thing. Mailing bags, parcel bags, postage bags, postal bags and poly mailers are all names for self-seal plastic bags used to post items.

What size parcel bag do I need for Vinted?
Most Vinted sellers use 10 x 14" for everyday clothing like dresses and jeans, 9 x 12" for T-shirts and tops, and 12 x 16" or larger for jumpers and coats.

Can I send these as a Royal Mail Large Letter?
The 6 x 9" and 9 x 12" bags can be, as long as the packed parcel stays within Royal Mail's Large Letter limits (353 x 250 x 25 mm, up to 750 g). Please check Royal Mail's current size rules before posting.

Are the bags see-through?
No. They're fully opaque with a black inner layer, so contents stay private.

Can I reopen and reseal them?
No. The seal is permanent for security, which keeps your parcel tamper-evident.

Are they waterproof?
They're water resistant and protect contents from rain and dirt in transit.

Can I write on them or use labels?
Yes. Shipping labels stick well and you can write on them with a permanent marker.

Is delivery free?
Yes, UK delivery is free on all orders, with no minimum spend.

Need larger quantities?

For bulk and trade orders, call or WhatsApp us on +44 7418 098951 for a bulk discount.

• These Opaque Mailing bags incorporate a permanent self-seal closure and are made from an opaque 60 micron film. Our posting bags self-adhesive strong closure, water and dirt resistant air sealed bags made for Secure the inside and outside.
• Safe and Secure Package Bags:- These plastic mailers have a sticky strip for easy closure. Once sealed, these bags are very hard to open allowing your items to arrive safely without risk of opening or tampering.
• Small to Large Mailing bags 6 x 9 Inch / 9 x 12 Inch / 10 x 14 Inch / 12 x 16 Inch / 14 x 19 Inch. Parcel bags for posting Mailing Packaging and more
• Plastic envelopes for posting:- iSOUL Small to Large postage bags are very light weight and sturdy. You can use its full size or put something smaller inside and wrap the excess before sealing.
• These Plastic Postage Bags are can be use in any Courier or sealed Airtight storage Purpose, you will get these bags in five different sizes for any size packing material, with the self-seal lip make the parcel air tight and water resistant for personal and business use.