The standard inert sex toy plastic is ABS plastic---in general, if it's totally hard plastic with no softeners, it's probably not going to cause a problem---I would expect your Caboodles case to be just fine.
I do my best to only buy inert toys---I have all silicone, glass, ceramic, wood-with-Lubrosity-co ating, and metal toys, and only 3 made of elastomer, and one of a mystery TPR-something. I keep all leather separately from things of different colors, and I keep my elastomer dildo in a separate bag, and my two elastomer bead strings in the same Ziplock separate from everything else. The mystery toy gets solitary confinement as well. As for the rest, all my glass and ceramic are kept in pouches or socks to avoid scratches, and all the rest are happily next to each other with no negative effects
(The safer your toys are for your body, the easier they are to keep safe and clean
Nice little double-benefit.)