??? before one than two days ??? if you take just BBS, food and water than is a 2 day but if you have full equipment (raincoat, tent???) then 1 day ??? I put my shovel on a back mole and sleeping bag under the pack and tight sleeping bag on both sides for mole ??? OK I know???it is an assault bag :) approximately 30 l and you should have one more for 3 days ??? app 65l