i know this question is old, but I'll answer it in case someone else wants to know. if you take the camera block out, you'll have plenty of room for a couple layers, food, the dog, the kitchen sink. ok, ok, maybe it's not that big, but it's got plenty of room. if you have the camera block in, you'll be able to fit a light layer or two or maybe part of a heavier layer, but it would be tight. you also could fit some food (depending on what you're talking about) if you want. the problem would be, the other big pocket (other than where the camera goes) is narrow. i usually put books and magazines there when I'm traveling. but it has a few extra smaller pockets including a pocket with an adjustable top strap for a water bottle. i think it would be great for a day pack or a camera pack, but probably not both at the same time unless you make sacrifices on both ends.