Mailing bags packaging guide

What is a jiffy bag?

Jiffy bag is the name given to any kind of mailing envelope with some form of cushioning as a liner. They have a very strong pure Kraft paper outer and a lining of macerated paper fibres.

Jiffy bag remains the only truly eco-friendly postal bag as it is easily reusable and recyclable.

Jiffy bag sizes

Airkraft Mailmiser Internal size External size PIP Suggested use
AK000 MM000 90 × 145mm 120 × 160mm Large letter A7 jewellery
AK00 MM000 115 × 195mm 145 × 210mm Large letter A6 floppy disks
AK0 MM0 140 × 195mm 170 × 210mm Large letter CDs
AK1 MM1 170 × 245mm 200 × 260mm Large letter A5, videos, DVDs
AK2 MM2 205 × 245mm 235 × 260mm Large letter Small gifts
AK3 MM3 220 × 320mm 250 × 335mm Large letter Desk diary
AK4 MM4 240 × 320mm 270 × 335mm Packet A4 brochures
AK5 MM5 260 × 345mm 290 × 360mm Packet Books, 2 DVDs
AK6 MM6 290 × 445mm 320 × 460mm Packet Shirts, clothes
AK7 MM7 340 × 445mm 370 × 540mm Packet A3
Padded bags
Padded bags Internal size External size PIP Suggested use
PB00 105 × 229mm 120 × 254mm Large letter A6, audio tapes
PB0 135 × 229mm 150 × 254mm Large letter
PB1 165 × 280mm 180 × 305mm Large letter A5, CDs, videos
PB2 195 × 280mm 210 × 305mm Large letter
PB3 195 × 343mm 210 × 368mm Large letter
PB4 225 × 343mm 241 × 368mm Large letter A4
PB5 245 × 381mm 260 × 406mm Packet
PB6 295 × 458mm 310 × 483mm Packet
PB7 341 × 483mm 356 × 508mm Packet A3
PB8 442 × 661mm 457 × 686mm Packet A2

Royal Mail PIP guidelines

  • Our mailing bags comply with Royal Mail pricing in proportion guidelines. The following table shows Royal Mail pricing in proportion requirements, limitations and details for each option.
Royal Mail size, weight guidelines
PIP Size Max length Max width Max depth Max weight
Letter 240 mm 165 mm 5 mm 0.1 kg
Large letter 353 mm 250 mm 25 mm 0.75 kg
Small parcel 450 mm 350 mm 160 mm 2 kg
Medium parcel 610 mm 460 mm 460 mm 20 kg
Large parcel 610 mm 460 mm 460 mm 30 kg

Rolls and postal tube shaped items

For rolls and postal tube shaped items, the length of the item plus twice the diameter must not exceed 104cm. The greatest dimension (either the length or diameter) must be no greater than 90cm.

Jiffy bag questions

  • How do I work out if my box will fit in the jiffy bag?

    Take a soft tape measure and wrap it round your box in both directions. Halve these measurements to give the basic bag dimensions. Find the nearest jiffy bag size that will take this size plus a bit for packing.
  • Are slim hard backed books suitable for jiffy bag?

    Hardback books will suffer from depression on the corners whilst being otherwise fine. Slim book are suitable for jiffy bags.
  • Can I send large bolts and nuts through the post in jiffy padded bags?

    Yes, pack the items tightly together.
  • Can I send china mugs in jiffy padded bags?

    No, use cardboard boxes.
  • Are jiffy padded bags recycled?

    The lining of jiffy padded bags is made entirely of recycled paper fibres. The outer of the bag is made of pure kraft paper from sustainable forests. The padded bag is totally recyclable as it is all paper.

Mailing bags packaging guide last updated: May-2023

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