This Hard Bottom Backpack from HART is designed and constructed for maximum utility and comfort. Since you?ll be carrying heavy tools around inside your backpack, it needs to be durable, which is why we constructed ours from rugged 1680 denier fabric. The bottom of the bag has a hard waterproof PVC base that provides stability and protection from mud, dirt and debris. Tool packs also need to be comfortable?after all, you?re carrying a lot of weight on your back. That?s why we designed ours with foam-padded shoulder straps and a harness to keep the bag secure and in a comfortable position for long periods of time. The outside of the pack has convenient tape and measure pen pockets that give you direct access without having to open the main compartment. And a padded laptop pocket gives you a secure place to store and protect valuable items. Includes HART?s limited lifetime warranty.