We've designed this pack for big adventures so you can go long in terms of storage, comfort, and functionality, but we didn't stop there. Some fun tweaks on the pack allow it to be condensed down to still perform great in short distances too. Most notably is our load leveling system that works amazingly well to stabilize odd or sloshly water bladders/bottles/gear in the bottom of the pack by compressing the back vertically. The shock cord layout on the back compresses horizontally too in case you have it packed really light.
The top of the bag opens through a military grade zippered opening and is also a roll top. This allows for adjustability from 15 to 21 liters. 
The elastic chest harness works wonderfully for ladies and just as well for guys. Sizing is quite versatile too from the very petite up to about a 52" chest. If you fit our Endurance Pack, which works for 99% of users, you'll love this fit.
The front chest harness has soft flask storage of 450ml or 600ml. These are for optional purchase and can be purchased at this link. The two small pockets in front of the flask pockets are for stick packs/trash/etc. There are also two shoulder pockets for your phone, chapstick, and nutrition. 
The rear compartment features bladder storage for up to 3L bladders. We prefer the 2L bladder for this pack which it comes with.
The right side of the pack has a 9" long zippered opening for access to maps, jackets, headlamps. The size of the pockets reaches across the pack, so you can really load it up. It's integration inside the pack also creates a divider when loading gear from the top. 
The left side of the pack features a bottle compartment which holds most any water bottle, and the 1" bar tacked nylon on the back works great for holding trekking poles with our optional Trekking Pole upgrade. 
The bottom of the pack features a 20mm attachment system for sleeping pads or affixing additional gear. 
Weight without bladder: 22oz
Made in: Vietnam
Sport focus: Trail and Ultrarunning, Fastpacking, Adventure Racing, Hiking, Mountain Biking