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.

A large travel bag with a capacity of over 50 liters is suitable for medium to long distance travel and more professional exploration activities. For example, when you want to go on a long-distance trip or mountaineering expedition to a region like Tibet, you should undoubtedly choose a large travel bag with a capacity of over 50 liters. Some short to medium term trips also require a large travel bag when camping outdoors, as only it can hold the tent, sleeping bag, and sleeping mat you need for camping. Large travel bags can be divided into hiking bags and long-distance travel bags according to their different purposes.