Like anything that’s built to last, VETO PRO PAC tool bags start with a butt-kicking foundation. In this case, it’s a 3mm thick polypropylene base that is not only waterproof, but “drop from the second floor” proof. Next we oriented the storage system vertically using interior pockets made of PVC-impregnated 1800 denier, a waterproof nylon that can take whatever a flathead or Phillips head screwdriver can dish out.