When traveling alone, you can choose a backpack of about 25 to 35 liters. When traveling with family and children on holidays, from the perspective of caring for the family, you need to choose a backpack of about 40 liters. There are many external systems to help families bring umbrellas, cameras, food and other items.
Because men and women have different body sizes and load carrying capacities, the choice of outdoor backpacks is also different. For a short day or two outing, a unisex backpack of about 30 liters is sufficient. For long-distance travel or camping for more than 2 to 3 days, when choosing a backpack of 45 to 70 liters or larger, generally, men choose a backpack of about 55 liters and women choose a 45 liter backpack.
According to itinerary
For day trips, outings, cycling, and mountain climbing activities, choose a backpack less than 30 liters. For two to three days camping, you can choose a 30-40 liter multifunctional backpack. For hiking for more than four days, you need to place tents, sleeping bags, moisture-proof mats and other outdoor equipment. You can choose a 45 liter backpack. In addition, the general outdoor activities are different from the backpack used when climbing high mountains. The backpack used for mountain climbing does not have many parts. Friends who like climbing should pay attention.
According to length
Before choosing a backpack, you first need to measure your back upper body length, that is, the distance from the cervical spine protrusion to the last lumbar spine. If the trunk length is less than 45 cm, you should buy a small bag. If the torso length is between 45-52 cm, you should choose a medium bag. If your torso is longer than 52 cm, you should pick a large bag.