REI's web page for the Gregory Whitney backpack lists its volume as

87 / 95 / 103 liter

What do you think this exactly mean? Does the backpack have three different ways to use with these different volumes? If so, any idea how they are different?

2 Answers 2


The increase in pack height to accommodate the S, M and L torso ranges changes the capacity. You'll note the weight is also different because of the extra fabric needed. The hipbelts usually change size quite a bit also since you apparently can't have a tall torso with a skinny waist.

  • I easily break the torso waist rule. It's not actually a good thing. it's really hard to find a pack that sits on my back and holds around my waist nicely.
    – Desorder
    Oct 12, 2016 at 21:32
  • @Desorder I don't know if it's a good rule in the first place, I'm only 5'9" and I can barely find packs that are small enough for my waist Oct 14, 2016 at 19:25
  • @Raystafarian That's what I said. :D
    – Desorder
    Oct 14, 2016 at 20:30

It looks like those the backpack comes in three sizes, Small, Medium and Large and what you are seeing is the volume for each size.

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