I've been searching thru the container store site for possible outworlds, and found these I was thinking of trying for an outworld:
Pros: Curved edges, good sized and stackable.
Possible Cons: It has the vent holes (that would have to be covered in mesh), not sure how drillable to add tubing, and not sure how good the lid will be.
Anyone try these/have any thoughts? I know dspdrew frequents the Container Store a lot, not sure if he's tried them. Thanks!