Postal

Blue Polythene Mailing Bags Self-Seal Plastic Postal Bags

Name: Blue Polythene Mailing Bags Self-Seal Plastic Postal Bags
SKU: 6303
Availability: InStock
Rating: 4.8 (354 reviews)

4.8 · 354 reviews

Durable and tamper-proof, available in a wide range of sizes for packages of any size.

Eye-catching blue, black lining for privacy
Permanent peel and seal closure
Waterproof and tear-resistant
100% recyclable

From £3.59 Ex. VAT (£4.31 Incl. VAT)

Size

Pack

Clear

Enter your postcode for exact dates and rates to your area.

Standard delivery

3–4 days

Sun 20 Sep – Mon 21 Sep FREE over £25

Priority delivery

1–2 days

Fri 18 Sep £2.95

Ordered today? Dispatched the next working day

Estimated dates — delivery options & rates are chosen at checkout.

Free UK mainland delivery over £25 · dispatched same day if ordered before 2:30pm

30-day easy returns

Need a custom size or large quantity?

Tell us what you're after and we'll source it or quote a bulk price.

Get a quote

Parcel trackingFollow every order to your door

1-hour delivery slotKnow exactly when it arrives

Sustainably sourcedFSC® board & recyclable

Looking for something a little different?

All sizes in this range

Every size in this range, with pack quantities. Choose your size and quantity above.

Size (Width x Length + Turn Over Seal)	Size (Width x Length + Turn Over Seal)	MU / Gauge	Size Format	Pack
6.5" x 9" + 1.5"	165mm x 230mm + 40mm	55 Micron / 220 Gauge	Letter	2000 Per Box
9" x 12" + 2"	230mm x 300mm + 50mm	55 Micron / 220 Gauge	Large Letter	1000 Per Box
10" x 14" + 2"	250mm x 350mm + 50mm	55 Micron / 220 Gauge	Large Letter	1000 Per Box
12" x 16" + 2"	305mm x 405mm + 50mm	55 Micron / 220 Gauge	Small Parcel	500 Per Box
16" x 21" + 2"	405mm x 530mm + 50mm	55 Micron / 220 Gauge	Medium Parcel	500 Per Box

Description

Your parcel doesn't have to look like everyone else's. Blue Polythene Mailing Bags bring a pop of colour to the doormat that customers remember, while the opaque black inner layer keeps contents private and secure from dispatch to delivery. It's branding and protection in one simple bag.

Made from strong co-extruded polythene at 55 micron (220 gauge), they're waterproof, tear-resistant and built to shrug off the rough handling of the postal network. The 40mm peel and seal strip forms a permanent, tamper-evident closure in seconds, with no tape or tools required, making them ideal for busy packing benches and solo sellers alike.

Five sizes align with Royal Mail formats, from a 6.5" x 9" letter bag for small accessories, through 9" x 12" and 10" x 14" large letter sizes for t-shirts and lightweight clothing, up to 12" x 16" small parcels and 16" x 21" medium parcels for jumpers, shoes and multi-item orders. Pink and purple versions let you colour-code or match your brand.

Light enough to keep postage down and 100% recyclable, they're a favourite with fashion brands, marketplace sellers, subscription boxes and gift businesses. Available from a single bag through to packs of 10, 50, 100 and boxes of up to 2,000, they scale from first sale to full-time operation.

Specifications

Size	6.5" x 9" + 1.5" (165 x 230 + 40mm), 9" x 12" + 2" (230 x 300 + 50mm), 10" x 14" + 2" (250 x 350 + 50mm), 12" x 16" + 2" (305 x 405 + 50mm), 16" x 21" + 2" (405 x 530 + 50mm)
Pack	1, 10, 20, 30, 40, 50, 100, 200, 500, 500 (Full Box), 1,000, 1,000 (Full Box), 2,000 (Full Box)

Delivery & returns

Free UK mainland delivery on orders over £25. Order before 2:30pm (Mon–Fri) for same-day dispatch; standard delivery is 3–4 working days. Priority delivery is available at checkout.

30-day returns: if you order the wrong size or change your mind, return unused items in their original packaging within 30 days for a credit, exchange or refund (subject to our terms).

Reviews (0)

The star rating shown is a combined rating from our sales channels (354 ratings). The written reviews below were left by customers on this website.