2,000 Cubic Inches / 33 Liters
Body Dimensions: 6" x 10" x 25".
Body Capacity: 1,500 cubic inches.
The Center and Side pockets add an additional 500+ cubic inches.
This size is best suited for short trips. With a compact gear list it
can hold two or three days of food. Additional space for longer trips can be created by
lashing items to the outside using options such as a top strap, shock
cord lashing, base loops, etc.
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2,600 Cubic Inches / 43 Liters
Body Dimensions: 6" x 12" x 29".
Body Capacity: 2,088 cubic inches.
The Center and Side pockets add an additional 600+ cubic inches.
This is the size that I used on all three of my
thru-hikes. I was generally able to carry 4-5 days of food in
addition to 5-6 lbs of gear and 1-4 liters of water. I've managed to
carry up to 11 days of food with this size pack by lashing lighter items
to the outside of the pack. Note that frameless packs can be
uncomfortable with loads over 20lbs, but once in a while is usually
fine.
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3,200 Cubic Inches / 53 Liters
Body Dimensions: 6.5" x 13" x 31".
Body Capacity: 2,620 cubic inches.
The Center and Side pockets add an additional 650+ cubic inches
This size should give you some extra space, maybe for a thicker sleeping
pad-frame, or for bulky winter gear.
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Keep in mind that frameless packs
can become uncomfortable with loads over 20 lbs / 9 kg regardless of the size.
Heavier loads once in a while are fine, but consider choosing a stronger material like Dyneema,
and adding carbon fiber stays if you need to carry heavy loads on a regular basis.
If you plan to carry over 30 lbs regularly you probably need a more
robust pack than the ones I build.
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