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
AirkraftMailmiserInternal sizeExternal sizePIPSuggested use
AK000MM00090 × 145mm120 × 160mmLarge letterA7 jewellery
AK00MM000115 × 195mm145 × 210mmLarge letterA6 floppy disks
AK0MM0140 × 195mm170 × 210mmLarge letterCDs
AK1MM1170 × 245mm200 × 260mmLarge letterA5, videos, DVDs
AK2MM2205 × 245mm235 × 260mmLarge letterSmall gifts
AK3MM3220 × 320mm250 × 335mmLarge letterDesk diary
AK4MM4240 × 320mm270 × 335mmPacketA4 brochures
AK5MM5260 × 345mm290 × 360mmPacketBooks, 2 DVDs
AK6MM6290 × 445mm320 × 460mmPacketShirts, clothes
AK7MM7340 × 445mm370 × 540mmPacketA3
Padded bags
Padded bagsInternal sizeExternal sizePIPSuggested use
PB00105 × 229mm120 × 254mmLarge letterA6, audio tapes
PB0135 × 229mm150 × 254mmLarge letter
PB1165 × 280mm180 × 305mmLarge letterA5, CDs, videos
PB2195 × 280mm210 × 305mmLarge letter
PB3195 × 343mm210 × 368mmLarge letter
PB4225 × 343mm241 × 368mmLarge letterA4
PB5245 × 381mm260 × 406mmPacket
PB6295 × 458mm310 × 483mmPacket
PB7341 × 483mm356 × 508mmPacketA3
PB8442 × 661mm457 × 686mmPacketA2

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 SizeMax lengthMax widthMax depthMax weight
Letter240 mm165 mm5 mm0.1 kg
Large letter353 mm250 mm25 mm0.75 kg
Small parcel450 mm350 mm160 mm2 kg
Medium parcel610 mm460 mm460 mm20 kg
Large parcel610 mm460 mm460 mm30 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: Nov-2021

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