A, materials and technology:
In fact, the material of the backpack is far less meaningful to us than the design of the backpack. Backpack consists of the following main materials: fabric, plastic fastener, outer belt, zipper, backpack system filler and backpack system metal frame. At present, most backpacks are made of DuPont waterproof and tear-proof fabric, and there is no problem with external straps and plastic fasteners. As long as the zipper is YKK's, that's fine. Basically, all brands can do it, and the metal pillars of the backpack system are mostly reliable. Therefore, it is necessary to pay attention to the fillers used in the backpack system, which must be plump and soft for a long time and will not deform and shrink. A good filler is generally pinched by hand, and a certain strength can be felt, and the pinched place can be recovered immediately. Of course, it is difficult to distinguish some subtle feelings in the new packaging. You can look at the filler of BIGPACK, which is quite good. In terms of materials, there is no need to worry about importing genuine backpacks, but at present, the supply of backpacks is complicated, so don't be greedy and buy imitations. Technology is another factor that determines the durability of backpacks. Basically, every seam on the backpack should be able to withstand more than 3 times the full load of the backpack, and the cutting of each part must be uniform and symmetrical, and the thread ends should not be exposed. To sum up, we must choose a well-known brand with a good reputation to ensure good materials and workmanship (this kind of bag over 50 liters is usually higher than that in 600 yuan).
B, the design of the backpack:
Backpacks come in a variety of styles and designs. The design of the backpack will really affect how you feel when carrying a load. First look at the backpack system. Brand-name bags generally have their own patented backpack designs, such as TCS, CR of BP(BIGPACK), X of SEA TO SUMMIT, CI of KINGCAMP, ABS of VAUDE, etc. You can't feel the difference of various backpacks in Hunan's leisure outdoor activities, so you should focus on the length and width of your upper body to choose the right size. Measure the length from the spine to the waist. This is the length of the backpack system you need, and the width is slightly wider than the distance between the two shoulder blades. Also pay attention to the compatibility between the size of the backpack system and the size of the backpack. If the width of the loaded bag is more than 6CM wider than the backpack system, it will be uncomfortable to carry. The bottom of the loaded bag should not be lower than the middle of the hip, and the lower part of the bag should also avoid external heavy objects. A good backpack should also be as close to the body as possible, and there should be a belt on the shoulder strap to tighten the distance between the bag and the shoulder strap and adjust it to the tightest. At the same time, a good back will form a space in the middle of your back, which is conducive to sweating. Next, the design of the bag body. It is a failure to get a big backpack above and a small backpack below. When you walk, you will feel that the bag is dragging you and you have to use your ass backpack. If the bag is too wide and shakes badly, you may be in danger in a steep or slippery place. Generally speaking, slender or some large and small backpacks are more conducive to our use, especially in Hunan. Secondly, the loading design of the bag. Backpacks must have three basic independent loading spaces: the bottom sleeping bag bin, the top bag and the main bag. The rest depends on your needs. BP's DISCOVERY series also has side bags, water bag bins and 10 liter outer bags, which are quite good. Finally, the external system, there should be external straps on both sides of the backpack and in front of the sleeping bag bin. It is better to have a plug-in strap at the top. If you need to hang an ice pick, there should be two insertion points on the front of the bag. Oh, I almost forgot that the bottom of the backpack must be made of thick and wear-resistant material.
C, the use of the backpack:
The correct packaging method follows the following principles: heavy objects are placed inside and above, and light objects are placed outside and below. Commonly used small items are put in the top bag or attached bag. All items are sorted and put into plastic bags before packaging. If the external object is not long, the heavy object is hung on the top of the bag, the light object is hung on the bottom of the bag, and the long object is hung sideways. Tighten the adjustment belt to make the backpack as close to the body as possible. Adjust the backpack so that the weight is evenly distributed, make appropriate dynamic adjustments when walking, and take turns to slightly relax the shoulders and waist. The load of the backpack should not exceed 30% of the weight, otherwise it is easy to cause injury.
D. necessary accessories:
Backpack rain cover, the backpack itself is not rain-proof, it is hard to imagine walking in Hunan without rain cover. I don't want to buy a rain cover, even a kettle, and I just drink water from my sleeping bag. There are four external straps on the backpack, each of which has a different purpose. In some cases, it can save 20 liters of bag volume.
Backpack, as the most important outdoor equipment, has various choices and complicated details. Remember to buy a backpack with good reputation and good after-sales service based on the principle of adapting to your actual situation. Similarly, no backpack can be perfect, and you need to choose it according to your actual needs and economic ability.
Maintenance: after each use, it should be dried in the shade, not exposed to the sun. When cleaning, you can wipe or pat the cloth with water, but you can't wash it with water or use detergent. It is not allowed to hang the shoulder strap on the hanger for storage, which will deform the shoulder strap after a long time. Each fastener is loose when not in use. It's best to fill in some paper or foam for preservation.