Nix having a whole lot of water, a teaspoon or two is fine. 2 mm bag and a few pieces of styro peanuts inside for him or her to hold on to. fill with o2 and tie it up. Works fine for me and that how they are shipped to me too
Oh yeah, square off the ends of the bag with tape to remove edges.
Breather bags are a little delicate for crabs.
square off the ends?