Backpack Sizing

OmegaDeltaTau-35Tau-48
Omega Pack Sizing Chart (in inches)

Size Small Medium Large X-Large
Torso Length for Frame
< 18.25
18.25 to 19.25
19 to 20.25
> 20
Waist Size for Hip Belt
25.5 to 29
28.5 to 32
31.5 to 45
NA
Delta Pack Sizing Chart (in inches)

Size Small Large X-Large
Torso Length for Frame
15.5 to 18.75
18.25 to 20.5
> 20
Waist Size for Hip Belt
Up to 42.5
Up to 42.5
Up to 42.5
Tau-35 Pack Sizing Chart (in inches)

Size Small Large X-Large
Torso Length for Frame
15.5 to 18.75
18.25 to 20.5
> 20
Waist Size for Hip Belt
Up to 42.5
Up to 42.5
Up to 42.5
Tau-48 Pack Sizing Chart (in inches)

Size Small Large X-Large
Torso Length for Frame
15.5 to 18.75
18.25 to 20.5
> 20
Waist Size for Hip Belt
Up to 42.5
Up to 42.5
Up to 42.5

To determine your pack size you will need a flexible measuring tape and a friend.

How to Measure Torso Length
  1. Locate your C7 vertebra. To do this, lean your head forward and run your hand down your neck. The first major bump from a vertebrae should be your C7 vertebra.
  2. Locate the top of your hip bone (iliac crest) and draw an imaginary line between the top of your left and top of your right hip bone across your back.
  3. Measure the distance in inches between the imaginary line indicating the top of your hip bone found in step 2 and your C7 vertebra found in step 1, following the natural curve of your back
  4. Compare this number with Figure Four’s backpack sizing charts found below. If you fall in between sizes or near the limits of that particular size, Figure Four suggests:
    • Larger size for more comfort
    • Smaller size for more mobility
How to Measure Waist/Hip Size
  1. Wear clothing that you expect to wear on outings. If you expect to wear drastically different clothing (i.e. winter outings vs. summer outings), measure your waist/hip size for both types of clothing.
  2. Locate the top of your hip bone (iliac crest) and draw an imaginary line between the top of your left and top of your right hip bone.
  3. Measure the distance in inches around your waist approximately 2 inches above the imaginary line indicating the top of your hip bone from step 2.
  4. Compare this number with Figure Four’s backpack sizing charts found below. If you fall in between sizes or your measurement with 2 sets of clothing are different, Figure Four suggests the smaller size.