I have the Eugad playpen - link in the description below the video (quite a few people use this) crazy female syrians may try to dig their way out but works for some - if you use the zip ties rather than the black discs to hold it together there are less gaps, also can be folded away then and just need two discs to hold it together and then undo if you want to fold away. Not heard of a hamster being able to climb up them
Eugad Hamster Playpen and more hamster bonding - YouTube