To me corkbark is an amazing enrichment item for snakes/reptiles regardless of if they are in tubs or tanks. My only problem for them longest time is the cost of how much a slab or even decent chunk from big name companies like Zilla ect. So went on a search and found a website called Air Plant Supply.
I think for 20 to 30 bucks I bought the pieces above (they call them small pieces). Quality bark and looks like it’s clean and free of critters as well. And while they aren’t curved or tubes I’m betting the reptiles won’t care and will enjoy cramming themselves under or chilling on these all the same. The site has different sizes other than small, all the way up to large.