Our Boston Terrier is a hiking superstar but after about five miles or on a steep downhill trek we pop her in the Kurgo Dog Carrier Backpack and SHE LOVES IT! She gets in easily, sits comfortably and even sometimes rests her head to nap. The backpack also has a separate pocket with ample room for hiking snacks that doesn't impact the space in the dog compartment, even when full. We have used this on dozens of hikes and the product still looks brand new. The bottom is sturdy enough for our 18-pound pup - she even voluntarily sits in the backpack when we are at home even though her bed is right beside it! We are so happy with our purchase that we gifted one to my sister for adventures with her dachshund. One tip for owners with stocky dogs like ours, we folded a towel in the bottom of the dog compartment to give a little cushion and some height so her head is at the right level for the opening.