Yes, it's the same as the Alaska and can have some gaps at the corners.Thanks Daisy - I wasn't aware of the gaps - it's the same as the old Alaska cage isn't it? It does sound like a 40 gallon breeder tank or 160 litre bin cage would be better and both would be a better size. I can understand the appeal of a cage as there is no lid to make and it comes with a shelf already - less to buy. It's a shame there aren't bigger cages in the US - the Zanzibar is about the biggest.
Barred cages tend to be easier to set up for Chinese hamsters with ledges, hammocks etc, but security is more important so probably a tank or bin cage is better here.