I have a highly nervous dog who, I noticed in winter when he had his coat on, became much calmer and easier to walk. He couldn't spen all year in his water proof coat so I wanted a nice sized back pack (some I have seen look like small siutcases!) that also looked good. This one arrived promptly from the seller but unfortunatley on the second time of using the webbing broke away from one of the seams. It was replaced quickly by the seller without any trouble. The backpack itself fits snugly (maybe the straps are a bit too long) and I have put two small bottles of water (one each side for balance) in there and poo bags. It also has the room to carry my other dogs lead when we are up the woods and also her tennis ball. Mason has taken to it very well and it seems to give him confidence when he is out on his walks.