Generally, heavy items should be placed on the top, so that the center of gravity of the backpack is higher. This way, the person carrying the backpack can straighten their waist during the journey, and some of the center of gravity should be lowered to allow their body to bend and bounce through trees or climb on bare rock walls. During climbing (rock climbing backpacks), the center of gravity of the backpack should be close to the pelvic position, which is the center point of body rotation, to prevent the weight of the backpack from shifting to their shoulders during the hiking process, The center of gravity of the back packaging can be higher and tightly attached to the back.

Because outdoor travel bags are used in special environments, there are high requirements for the materials and craftsmanship of travel bags. All travel bags are sewn three times using a sewing machine to ensure the strength and durability of the stressed position. The buckle and other components of the travel bag can be used to prevent freezing, smashing, and deformation at 120 degrees Celsius without damage. The outer materials of travel bags mainly include 420D Oxford nylon, 1000D nylon, 600D or 1000D polyester, or 1000D CORDVRA materials.