I've now had this hiking bag for several months and taken it on a number of trails. It has several compartments, so I am able to put a camel pack for water along with any gear or snacks. I have a large cat the rides on my back when he is not walking himself. He is able to ride on top of my shoulders and get in and out of his compartment as he pleases. Much more comfortable on longer hikes than my more basic pet backpack.