The best pots, hands-down, are the huge round ones with four doors, with a ramp to each door. Three door ones work OK, and I wouldn't use two door ones, I'd rather use the four-door cheapo folding ones with a few mods. If you buy the cheapies, get some extra rubber coated chicken wire and make some little pieces that fit on the bottoms of the doors, that bend at a 90 degree angle and form to the floor... basically you're making something so that if the crabs are near the doors and trying to get out, they are standing on this piece, holding the door shut. It takes a little messing with, make sure all the doors close easily. The bigger the pot the better. Make sure you watch your pots. I made the mistake of buy an expensive one a couple of years ago, not watching it, some guys came along and stole it.

-N.