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Backpack Fitting

Step 2 - Contour the Internal Staves

Extra Small Internal Stave Length to a 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 maximum comfort.

Contour Staves XS-M 

Adjusting the Extra Small Internal Stave Length to a Medium Torso Length

Using the 50cm Internal Stave as an example, this process will create the equivalent of a 60cm Internal Stave length with a Medium Torso length of 46cm.

The Internal Staves are adjustable to two (2) lengths longer. This is achieved by decreasing the lower length of the Internal Stave by 5 cm from 18cm to 13cm and decreasing the upper curvature by 5cm. The upper Internal Stave is then contoured to the Medium Torso length which will be 5cm short of the shoulders at the upper curve. Finally, position the Upper Load Stabiliser Strap using the ‘Upper Load Stabiliser Strap - Upper Adjustment Buckle’ provided.

Steps for Contouring the Internal Staves -

  1. First, remove the Internal Staves from the backpack.
  2. Commence contouring at the Lumbar Lordosis the deepest part of the back, noting that the lower length of the Internal Stave below the Lumbar Lordosis is 13cm This is the lower length and first bend position in the Internal Stave. The easiest way to know where to begin bending the Internal Stave is to mark the Internal Stave at 18cm, then position this mark in the deepest part of the back.
  3. The Internal Stave is then contoured to match the back curvature with the 13cm mark in the deepest part of the back. The contour of the Internal Stave follows the curve of the back at either side of the spine to the final position. In contouring an Extra Small Internal Stave Length to a Medium Torso Length the upper curvature will be approximately 5cm lower than the top of the shoulder.
  4. Check that the back curvature you are fitting is symmetrical, as you may need to bend each Internal Stave a little differently. Generally, the back will be symmetrical and you can bend the second Internal Stave to the match the first Internal Stave you have contoured.
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Preston VIC 3072
Melbourne Australia
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