Hold's everything you need out on the trail. I carry my camera, two lens, remote shutter release, lens cleaning kit, SD card wallet it's got three zippers on the out side of it, the small one is just the right size for my SD card wallet. Then under that is a zipper that goes half way around the bag, I put a note book, pen, jack knife, maps, trail guide in. The main compartment is where you put your camera and lens. I also carry my lens cleaning kit extra battery. There's a small zippered compartment in side the main compartment this is good for your shutter release, HDMI cord, UBS cord, Whole bag is padded comfortable to pack adjustable shoulder straps and a grab handel. it has netted compartments on either side this is where I put my water bottle's It keeps everything together so I'm ready and organized to go at a moments notice. I like it a lot I've hiked a portion of the pacific crest trail with it and other day trips. Over all it gets a thumbs up for me.