It's a fairly large lunch bag, I can fit about four plastic containers, a mason jar (smoothie) and a cold pack inside of it. When I bring it home, I unpack it and leave the top unzipped to let it air out so it doesn't stink. Our cat, Raven, she knocks it over and climbs inside and lays down in it. I zipped her up inside of it once, she just laid back down. I believe she just likes the way the liner feels, or perhaps because it's "cool" from the ice pack. Either way, it's pretty funny. She also likes laying inside of Cherry Coke boxes. My wife and kids enjoy drinking soda, and the Cherry Coke boxes open from the top, so once they unload them into the fridge, they place the box on the floor near the recyclable bins... she climbs inside and uses it for a bed as well. She also uses my wife's purse. And I've caught her laying in our youngest son's dresser drawers when he leaves them open. Yes... Raven thinks she rules the roost.