Postal Boxes

Forms Plus stock a range of cardboard boxes that are ideal for e-commerce, mailing and fulfilment companies. Our postal boxes provide protection for valuable and fragile items, ensuring your goods are secure and arrive well presented. The boxes are lightweight but sturdy, offering a more professional and eco-friendly solution than mailing bags.

We stock a range of PiP boxes, designed to fit Royal Mail’s pricing-in-proportion size guides. Sizes include Small, C4, C5, C6 and DL (Large Letter) postal boxes, as well as Mini, Midi and Maxi (Small Parcel) postal boxes.

Our cardboard boxes are supplied flat packed to save on storage and are very easy to assemble. They are made from sustainable materials, fully recyclable and biodegradable.

For more details including individual box sizes and pricing, visit the individual product pages below. For a sample of any of our postal boxes, please contact a member of our Sales team who will be able to assist.

Forms Plus supply cardboard postal boxes in a wide range of depths and sizes including Royal Mail PiP sizes.  Our cardboard all comes from FSC or PEFC approved sustainable sources.

Box Sizing

SizeForms Plus Size NameSize also known asOptionsCreative UsesRoyal Mail size / weight limit
101 x 101mm x 20mmPostal Boxes Size 1SmallEco Postal BoxesGift Cards / Cosmetics / Jewellery / Place MatsLarge Letter (up to 750g)
163 x 112mm x 20mmPostal Boxes Size 2C6Eco Postal BoxesMobile Case / Cosmetics / Jewellery / Cards / Books / Photos / Stationery / Purse / Wallet / BatteriesLarge Letter (up to 750g)
218 x 108mm x 20mmPostal Boxes Size 3DLEco Postal BoxesCosmetics / Jewellery / Cards / Books / Photos Stationery / Purse / WalletLarge Letter (up to 750g)
225 x 160mm x 20mmPostal Boxes Size 4C5Eco Postal BoxesCosmetics / Jewellery / Cards / Books / Photos Stationery / Purse / Wallet / Gloves / HatLarge Letter (up to 750g)
202 x 143mm x 66mmPostal Boxes Size 5MiniEco Postal BoxesCandles / Photos / Cards / Books / Cosmetics / Mens Grooming / Toiletries / Stationery / Craft Supplies / Chocolates / PerfumeSmall Parcel (up to 2kg)
334 x 202 x 66mmPostal Boxes Size 7MidiEco Postal BoxesCosmetic sets / Books / Photo Frames / Hair Products / Stationery / T-ShirtsSmall Parcel (up to 2kg)
325 x 225mm x 20mmPostal Boxes Size 8C4Eco Postal BoxesT-Shirts / Magazines / CardsLarge Letter (up to 750g)
430 x 340mm x 73mmPostal Boxes Size 9MaxiEco Postal BoxesClothing / Books / Photo Frames / GamesSmall Parcel (up to 2kg)
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