 Backpack Construction
Construction FAQ's
C1 What materials are utilised in manufacturing White Mountain™
Backpacks?
- 950 Denier Kodra - Polyurethane Coated.
- 420 Denier Rip Stop Nylon - Polyurethane Coated.
- 420 Denier Nylon - Polyurethane Coated.
- 600 Denier Polyester - Polyurethane Coated.
C2 What is Bar Tack Stitching?
Bar Tack Stitching is multiple of straight stitching that crosses a piece
of cloth at a right angles. This provides added strength to that area of stitching.
C3 Do White Mountain™ Backpacks have Bar Tack Stitching?
All areas subject to stress have Bar-Tack stitching.
C4 What Thread is used on White Mountain™ Backpacks?
Nylon thread is utilised in all stitching of White Mountain™ backpacks providing
durability, strength and rot resistance.
C5 What stitching process is used on White Mountain™ backpacks?
All White Mountain™ backpacks are twin stitched at eight stitches per inch.
C6 What zips are used on White Mountain™ Backpacks?
YBS Coil Zips are used throughout the entire range of White Mountain™ Backpacks.
C7 What Buckles and Clips are utilised in White Mountain™
backpacks?
All Buckles, D-Rings and Clips utilised in the construction of White Mountain™
backpacks are National Moulding Duraflex and virtually unbreakable, non-slip
and easy to adjust.
C8 What Webbing is used on White Mountain™ Backpacks?
All webbing utilised in the construction of White Mountain™ backpacks is of
the highest grade Nylon or Polypropylene and heat cut to prevent separation
at the ends.
C9 How is the Backpack Length determined?
In designing backpacks for White Mountain™, measuring numerous body types
and studying backpacks manufactured for other wholesalers internationally, we
are able to establish some standard dimensions for internal frame backpacks.
One notable standard is the length of the base or bottom section of the Stave.
This is measured from the tailbone between the Coccyx and Sacrum, to the top
of the hip belt at the point where the hip belt crosses level with the hipbone
or Iliac Crest. This length on the majority of people measured is between 11cm
(4 3/8") to 14cm (5 1/2"), with the standard hip belt position set at the average
length of 12.5cm (5 0/0"). The point at which the hip belt meets the top of
the lumbar pad on the backpack can be as much as 20cm from the base of the stave.
But the point at which the hip belt crosses the hipbone or Iliac Crest is 12.5cm
or 5 0/0" from the base of the stave. The overall length of the parallel staves
after subtracting the lower back length of each stave and the approximate 3cm
reduction that is lost in bending the staves to the curve of the back, is then
the Optimum Torso Length. Most manufactures in the world today use 5 standard
stave lengths, 50cm, 55cm, 60cm, 65cm and 70cm. These standard stave lengths
can vary by as much as 2cm and would equate to an average Optimum Torso Length
of approximately 38cm (50cm stave), 42cm (55cm stave), 46cm (60cm stave), 50cm
(65cm stave), and 54cm (70cm stave). White Mountain™ use only 4 stave lengths
to a maximum stave length of 65cm.
Please look to our page on
Torso Length FAQ's for further details.
C10 How is the Backpack Width and Shape determined?
For total stability the backpack should be symmetrical and to counter balance
leg movement our arms need to move freely. For practical purposes such as moving
through scrub with a hike pack, or through people and city obstacles with a
travel pack, the width of the backpack should not extend beyond the width of
the body. Well designed backpacks are wider at the base (hip width) and taper
to the shoulder (chest width) conforming to the natural shape of the body. Generally
in the travel packs the width would be more square and wider at the shoulders
and the depth would be a little deeper than that of hike packs, but still not
extending beyond the body width.
C11 How is the Backpack Depth and Shape determined?
To determine the backpack depth it is then simply a matter of taking the
stave length (backpack length) and backpack width to build a backpack of the
correct depth to provide the capacity we are seeking. Although we are not limited
in the depth of the pack, the greater the depth of the backpack the more leverage
on the back. This is why we do not construct a backpack in Extra Large (Higher
Capacity) with a small stave length of 50cm, or a Net Torso Length of 38cm or
15". There is a natural tendency to lean forward when carrying weight
on our backs. By making the lower section of the backpack with less depth and
the upper section of the backpack with more depth a more natural posture is
possible. The larger opening on the throat provides easier access and the shape
does not prevent loading your backpack as required.
C12 How is the Internal Stave Positioning determined?
We first need to consider the areas of the back that are best suited to comfortably
bear weight, or the the areas of our body that have the best muscle cover. The
upper buttocks extending outwards offer the best lower back support in the hip
area. In the upper area, either side of the spine on the upper back, and the front of the chest
offer the best support. It must be noted that the lumbar position near our spine
is poorly padded and we would avoid placing weight directly on this area. The
correct position of the Internal Staves is then tapered at the lower back, either
side of the spine or lumbar region at the base of the backpack and then extending
upwards and outwards to the padded area either side of the spine on the upper
back.
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