big enough for an overnight...or two
marmot sleeping bag, few pieces of clothing, food for 2 people for 2 nights, stove, 3L bladder (in the mesh backpanel), camelback bottle, gatorade bottle (i drink a lot of water), coleman exponent stove, headlamp, snakebite kit,and camera all inside. attached keen newport h2's to the loops on the outside and strapped the tent to the outside. granted, i have the large but was able to have enough room for a weekend trip and saved more than 4 lbs over my full-sized pack (yes, i need an upgrade). my friend carried a little food for himself, the fuel, and pots as well as his own sleeping and other gear. i could have made room for a pot and fuel for a solo trip or just left those out all togther. love this pack and plan to use it commuting too.