Shoulder strap too narrow, large size not comfortable with 25lbs dog
I got the large size for my 25 lbs beagle. The dog sits in the bag without much problem. But the shoulder strap is too narrow, the total weight kills my shoulder. I really cannot imagine having this bag and my dog on my back for a bus ride longer than 10 minutes. I plan to return it. If your dog is below 20lbs, I would say it is worth trying. The quality of the bag is not great but acceptable. The buckles are flimsy, I don't think they will last long with a heavier dog.
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