My Raelle is 6.6lbs...I have the medium size Sherpa bag...it is soft sided and has a pad to line the bottom. Very sturdy and does not fold in on itself. Raelle absolutly loves it. It is Airline approved...dont have the link for it, but I do know it is sold at PetSmart. I bought mine online and found out later they are the same price at the store..
could have saved myself the shipping costs.