I used to carry a three drawer box with my garage tools. It was heavy and no matter how much I stuffed it with foam and rags, it always seemed to clatter. And it took up way too much room in the back of my SUT.
Ended up buying a tool set that stays in the truck. Craftsman has pretty nice sets in formed plastic cases. No rattle. I carry another duffle bag with larger tools wrapped in towels.
http://www.sears.com/sr/javasr/product.do?BV_UseBVCookie=Yes&vertical=TOOL&fromAu to=YES&bidsite=CRAFT&pid=00935155000