Crux Back Sizes and Fitting
Rucksacks are either size 1, 2 and 3, or Regular (R) and Long (L).
Where rucksacks only come in one size, this is equivalent to a Regular.
| Size |
Backlength |
Typical Height Range |
 |
| 1* |
45cm |
160cm - 170cm |
| R |
48cm |
155cm - 175cm |
| 2 |
50cm |
170cm - 180cm |
| L |
55cm |
175cm - 185cm |
| 3 |
60cm |
180cm - 190cm |
* Size 1 is optimised for women, but fits small men also.
Please note: The height range given for each back length is only a guideline and may not be right for your particular proportions. Crux always recommend trying on their 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.