Folds according to the number of people
When traveling alone, you can choose 25~35 backpacks. Holidays with family and children, from the perspective of family care, the need to choose 40 liters or so backpack, the external system is more, to help the family to carry umbrellas, cameras, food and other items.
Folds according to sex
Because men and women are different in shape and gravity, the choice of outdoor backpacks is not the same. Generally one or two days of short distance outing, men and women general about 30 liters of backpack can be. For more than 2 to 3 days of long distance travel or camping, to choose 45 to 70 liters or even larger knapsack, the male chooses about 55 liters of backpack, and women choose 45 liters of backpack.
Folds according to the stroke
Pick up 30 liters of backpacks on a daily trip, outing, riding and mountaineering. Two to three day camping can choose a 30-40 liter multifunctional pack, more than four days of hiking, to place outdoor equipment such as tents, sleeping bags, moistureproof mats, and more than 45 liters of backpacks. In addition, the general field activities and climbing backpacks are different. There are not many parts for mountaineering backpacks. Friends who like mountaineering should pay attention to them.
Folds according to the length of the body
Before choosing a backpack, you need to measure your upper body length, that is, the distance from the cervical vertebra to the last lumbar vertebra. If the trunk length is less than 45 centimeters, you should buy a trumpet bag. If the trunk length is between 45-52 cm, a medium-sized bag should be selected. If your trunk is above 52 centimeters in length, you should pick a large bag.