Anyone know of a catalog or web site with a good selection of military surplus equipment cases?  Plenty of places have ammo boxes, but I'm looking for something bigger, ideally something right at the limit of airline and UPS shipping sizes, say 48 x 30 x 12 .  I know I've seen ruggedized mil surplus polyethylene cases about this size in the past, but at the moment I can only find them too small or too big.  e.g. C&H Sales in Pasadena lists a beautiful case 37x35x16 for $100, but that's too big for UPS. Industrial surplus would be fine, too