I don't trust cloth playpens at all, due to little chewy teeth.

We've been using this playpen for a year and a half. It's sturdy and roomy enough for two people to sit inside. It's bigger than it looks in the pictures. We use a whelping pad underneath because a certain someone likes to pee on the floor when he's out.

Marshall Pet Products Pet Deluxe... https://www.amazon.com/dp/B0013TT2SS?ref=ppx_pop_mob_ap_share

Marshall Pet Products Pet Deluxe Play Pen, Small https://www.amazon.com/dp/B0013TT2SS/ref=cm_sw_r_cp_api_i_esqlDb883PDS8

Marshall Ferret Small Animal Playpen Mat/Cover 11 18"-Panel, Colors Vary https://www.amazon.com/dp/B0009YHROE/ref=cm_sw_r_cp_api_i_3rqlDb8BQNCG4

https://www.google.com/search?q=ferret+11+panel+fencing&rlz=1CDGOYI_enUS771US771&oq=ferret+11+panel+fencing&aqs=chrome..69i57.6895j0j4&hl=en-US&sourceid=chrome-mobile&ie=UTF-8

u can do the math to find out the approximate diameter of a circle, of course it can be made into squares or shapes with concavity. i cant remember if i got mine off amazon or 1800petsupplies but the latter does 30 percent off and free shipping on orders over $70 i think so i do my semiannual food and toy hauls through them