I'm very impressed with the sturdiness of this pack, it has withstood the antics of a 100 lb German Shepherd being dragged back in the house after a walk and multiple charges through light woods chasing after bunnies and squirrels without any damage. Absolutely worth the price, I've had multiple cheaper packs just fall apart within a few hours on the trail. The handle on top is great for helping dogs into cars or guiding them off path. The buttons that fasten the saddlebags to the harness are a bit tough to work, particularly on a squirming dog, but they're also very secure so that's fine with me. Seems to be comfortable, the medium snugly fits my GSD when fully let out and also fits my 45 lb Irish Setter when cinched in most of the way. My setter did get rubbed under her right foreleg but she has incredibly sensitive skin and it may have been too loose. I'd definitely buy again!