Step 2 - Contour the Internal Staves
Medium Stave Length to Medium Torso Length
After measuring the Torso length and determining the correct
size of backpack required, contouring the Internal Staves is the
second step in fitting a backpack.
White Mountain™ strongly recommend removing the Internal
Staves from all Internal Frame Backpacks and contouring these Internal
Staves to the individual back. If the Internal Staves are not removable,
then it will be necessary to bend the entire backpack to match the
individual back curvature.
Contouring the Internal Staves correctly is essential for correct
backpack fit and functionality. This enables the Internal Staves
to simulate the flex action of the spine, and when required allows
an effective transfer of approximately 80% of the weight to the
lower back. The base of the backpack should not protrude outside
or away from the body and sit squarely on the lower back. With the
Internal Staves carefully contoured to the back, the backpack in
the optimum position and provided the backpack is loaded correctly,
the distribution of weight through the Internal Staves will ensure
With a little patience, you can easily bend the two Internal
Staves to the contour of the back as illustrated in this diagram, detailed
Using the 60cm Internal Stave as an example, this process will
create the equivalent of a 60cm Internal Stave with a Medium Torso
length of 46cm.