Blue Polyethylene Postal Bags 12x16 Inch
The 12 x 16 inch blue mailing bags offer a balance between compactness and capacity, making them ideal for items like folded clothing, books, or accessories. Crafted from strong yet lightweight LDPE material, these bags are both eco-friendly and recyclable with the adhesive strip removed.
They are a great fit for Royal Mail small parcel services, helping you reduce courier costs. The bold blue shade also helps your parcels stand out, giving your packaging a professional feel at a low cost.
Ideal for: t-shirts, trousers, books, cosmetics sets, or small padded items.
Post Bags You Can Trust
These Blue bags for parcels are ideal for both personal and business shipments of all sizes. Available in several colours including grey, blue, Purple and more. The durability gives you the peace of mind that your parcel will arrive at its destination without any bother. For business owners trustworthy packaging supplies is a must to help keep any problems such as damaged items or a high volume of returns thats why we have made our bags to withstand all stages of transit.

Pink Mailing Bags Size Guides
Size Guide | Size in Inches | Centimetres | Compared to Paper Sizes | Best For |
---|---|---|---|---|
Medium | 10x14 inch | 25.4 x 35.5 cm | Slightly smaller than A3 | Light jackets, books, larger documents |
Medium | 12x16 inch | 30.5 x 40.6 cm | Close to A3 | Sweaters, jeans, medium plush toys |
Large | 15x18 inch | 38.1 x 45.7 cm | Between A2 and A1 | Multiple garments, larger plush toys |
Large | 17x22 inch | 55.8 x 43.1 cm | Close to A1 | Bedding sets, large textiles, posters |
All Round Packaging Solutions
At Mr Bags, we stock a wide range of packaging supplies, including cardboard boxes, packaging tape, and different types of postage bags like biodegradable mailing bags and more. We are dedicated to providing high-quality, affordable solutions that support small businesses in getting their parcels sent out efficiently and cost-effectively. Our commitment ensures you can send your items on time while keeping costs low for maximum profit.
Water Resistant
These blue mailing bags are made to resist moisture, rain, and accidental splashes—perfect for year-round shipping. Unlike cardboard boxes that easily become soggy and collapse, our plastic mailers stay strong and intact in damp conditions.

Made to Last
Strong and dependable, these blue parcel bags are made using high-quality plastic that won’t rip or tear easily. They offer excellent protection in transit, making sure your goods reach their destination just as they left.

Self Seal Adhesive Strip
Our blue mail bags come with an ultra-sticky peel-and-seal closure that gives you instant, secure packaging—no extra tape needed. Once sealed, the bag can't be resealed, helping deter fraud and interference.

Lightweight Material
These blue plastic mailing bags are made from lightweight material that helps reduce shipping costs. They're easy to store, quick to use, and perfect for businesses wanting to post efficiently without extra weight.

Royal Mail 24 Tracked
Dispatched same day if ordered before 5 pm Monday to Friday. Please allow up to 1-2 days for delivery.
£1.99
DPD Next Day
Dispatched same day if ordered before 3 pm Monday to Thursday. Not available to Scottish Highlands & Islands.
£4.99
Free on orders over £100