I wouldn't say it's better than old tennis ball container but ghost mantis hardly move except during catching flies or molting so I thought the 32 oz container would do, but since she is an adult now she may move around more often for food I dunno. The container is about 7" tall, and she's about 55 mm (i'm not sure didn't measure it). Also, the male ghost mantis has molted into adult so i'm thinking of puting this adult pair in the "keeper critters" cage which is about 3.5"x5"x6".