Skates are made for fitness, ordinary skating or disco and dance.Roller skating backpack.Although some bags may only be 100% nylon, some durable bags are strong and durable. Rip Stop and Denier are phrases worthy of attention because they are comparable to the materials used in the trampoline on the lake and are very reliable.If you leave your luggage in the locker room or on a business trip, having waterproof materials will help ensure that the interior stays dry.The reinforced bottom is an added protection at the bottom of the bag to enhance its durability. Sliding the bag left and right will increase the possibility that the bottom will appear first, so strengthening the bag will add some insurance.