My piggies LOVE these. I bought one at first to see if they liked it and they loved it so I bought a second so they could each have one. Then I bought 2 more so I could switch them out when I do their cage cleanings. These cavy caves are their favorite place to sleep, whether on top or in the bag. Ive also put one in their carrier when I've had to bring a pig to the vet so they would feel safe and cozie. I've had the first set for 2 years now and they are still working fine and look nice! My favorite are the grey, they go with all their fleeces.