I just buy the BP 3 1/2" 10 gauge white boxes and cut a piece of thick cardboard or styrofoam to slip in and take up the the slack...you box builders must have a lot of time on your hands:bigbye:

Just buy these and you don't have be concerned with them getting wet.
http://www.ballisticproducts.com/MTM...tinfo/1342514/

I've been using regular old 20 gauge 2 3/4" boxes . They only hold 16 rounds but thats plenty for what I need as usually I just box #4's and 00 Buck .