The large backpack has a volume of over 50 liters and is suitable for medium and long distance travel and more professional adventure activities. For example, when you are going to an area like Tibet for long-distance travel or mountaineering adventures, you should undoubtedly choose a large backpack with a volume of 50 liters or more. Some short and medium-term trips also require large backpacks if you need to camp in the wild, because only it can hold tents, sleeping bags and sleeping mats for your camping. According to different uses, large backpacks can be divided into mountaineering bags and backpacks for long-distance travel.
Mountaineering bags are generally long and thin, so that through narrow terrain, the body is divided into two layers, the middle of which is separated by a zipper sandwich, which is very convenient when picking and placing items. The tents and cushions can be tied on the sides and top of the backpack, virtually increasing the volume of the backpack. There is also a hail set outside the backpack, which can be used for binding ice axes and poles. The most worth mentioning is the back structure of these backpacks. Inside the bag is a lightweight aluminum alloy frame that supports the body. The shape of the back is designed according to ergonomic principles. The back is wide and thick, and the shape conforms to the human physiological curve. The "S" design also has a chest strap that prevents the strap from sliding sideways, making the backpacker comfortable. And these backpacks all have a strong, generous and comfortable waistband, and the height of the harness is adjustable. Users can easily adjust the strap to suit their height according to their body shape. Generally speaking, the bottom of the backpack is located above the buttocks, so that more than half of the weight of the backpack can be transferred to the waist, thereby greatly reducing the burden on the shoulder and reducing the shoulder damage caused by long-term load.
The long-distance travel backpack has a similar bag body structure and a mountaineering bag, except that the bag body is wider and is equipped with a plurality of side pockets for sorting and arranging scraps. The front face of the long-distance travel backpack can usually be fully opened, and it is convenient to pick and place articles.
Medium-sized backpacks typically have a capacity of between 30 and 50 liters. These backpacks are more versatile. They can be used for 2 to 4 days of field trips, inter-city trips, and some long-distance non-camping self-service trips. Now. Carry clothes and some everyday items can be packed. The style and variety of medium-sized backpacks are more varied. Some backpacks add some side pockets, which are more conducive to packing items. The back of these backpacks is roughly the same as a large backpack.
The volume of small backpacks is less than 30 liters. Most of these backpacks are generally used in cities. Of course, they are also suitable for outings of 1 to 2 days.
For more information, please pay attention to China Backpacking Network