Here in the southwest the wax would melt and make a mess. I think Mr. Ritter covered this in his re of a survival kit. Over the holidays I bought some nice tins with small kids puzzles in them. A bit larger than an altoids but much tougher. The puzzles were 50 pieces and reated for 5 and up. Only took me an hour to put Spongebob together. A trick I use is to wrap clear cellophane tape arond the rim of the container, this mad=kes the lid fit tightly, then I use electrical tape.