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the materials used in the backpack are waterproof and very wear-resistant. the backpack has a wide and thick back and a belt that shares the weight of the backpack. large backpacks have an inner aluminum frame or an outer aluminum frame that supports the body. large travel bags are similar to hiking bags but have different body shapes, and the front of the travel bag can be fully opened by zippering, which is very convenient for accessing, unlike hiking bags, which usually put items into the bag from the cover of the bag. hanging bag type and backpack type. the bag hanging type can be carried on your back or on the front or back rack of your bike. the backpack type is mainly used for bicycle trips that require high-speed cycling..syi