When In its new home, hamsters will need at least 3 days without human contact to reduce the risk of extreme stress and stress related illnesses. At least 3 inches of bedding is required for the well being of the hamster and provide hiding places.
Sure, these cages look like a good hamster home to humans, but for hamsters, it's too small and can stress a new hamster. The minimum cage size is 360 square inches for all species. Crittertrail cages are only suitable as an add-on and shouldn't be the only habitat.