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size		Backlength (cm)	Typical height range (cm)	Backlenght (inches)	Typical height range (inches)
W1	Women	40 cm	150 – 160 cm	15”	5’0” – 5’4”
U1	Unisex	42 cm	160 – 170 cm	17.5”	5’4” – 5’9”
W2	Women	45 cm	160 – 170 cm	19.5”	5’4” – 5’8”
U2	Unisex	48 cm	170 – 180 cm	19.5”	5’6” – 6’0
M2	Men	50 cm	175 – 190 cm	21.5”	5’8” – 6’0”
M3	Men	55 cm	180 – 190 cm	21.5”	6’0” – 6’4”

Please note:

The height range given for each back length is only a guideline and may not be right for your particular proportions. We always recommend trying on our rucksacks before you make your final choice.

Typically, the hip-belt should wrap around the top of the pelvis, so that the hips are able to share the overall load (see diagram). But you may wear your rucksack differently, and this will also affect your choice of size. For example, some climbers carry their rucksack “high” – in other words, around their waist and thus above the pelvis – and may prefer a rucksack with a shorter back length.