In general, there are soft Daypacks, External Framed Packs, and Internal FramedPacks on the market. The type of package you buy is mainly about what kind of activities you are usually passionate about. In general, if you just go for a general city tour, a single-day hike, or a one-day suburban climb, don't use a tent sleeping bag or a stove, buying a daily backpack is enough. The capacity ranges from 10 liters to 40 liters, and there is not much difference among various brands. These bags are similar to those used by students. The multi-function bag also has a belt. When buying, pay attention to the work of the shoulder strap. The zipper is preferably a coarse-teeth YKK. In any case, it is best to bring your commonly used equipment to the store to try when buying a package. Must be critical, inappropriate and uncomfortable do not make do. The businessman selling the package is more concerned about how much money he can make, but for you, this is not only a simple matter of a few hundred dollars. What are the advantages and disadvantages of outer rack? Outriggers once used to dominate outdoor backpacks. Outside of this kind of bag there is an H-shaped metal frame, outside the box can be hanging photography, stoves and the like. Outriggers are not very expensive, and they are more convenient for backpacking. If you often go to places that are relatively flat and open, large backpacks can be selected outside the package. The disadvantages of the outer frame package are also obvious. In general, the outer bag is less comfortable than the inner bag. Its carrying system is mainly based on thick shoulder straps, and it is difficult for backpackers to master balance when the route is complex. If you need to go hiking, skiing, or climbing through a wooded cave stream, it's best not to carry outside racks. In addition, it is inconvenient to carry public transportation on the back outer frame. You can't carry a bunch of equipment like a big crab and crowded out a bus. The long-distance train rack isn't that big. It's also troublesome to check in. Even if you take a taxi, you may not be able to fit into the back box. . If you choose a rack bag? When you see a variety of colorful interior racks in the equipment store, you may feel at a loss. The interior rack bag now basically monopolizes the market for large backpacks, and many manufacturers also have their own skills in this area. Although the interior racks were originally designed for climbers, skiers, and difficult hikers, it has been recognized by more and more people. Therefore, many people choose to use the inner rack bag when buying large backpacks. The rack bag also has a shelf, but the shelf is placed inside the bag. The shelf is usually aluminum alloy, fiberglass, or carbon fiber. This shelf can be attached to the body of the backpacker. A good backpack can also adjust the shelves according to your body shape to make the backpack more close. To pick a bag within the interior, be sure to pick a close-fitting body and only fit it properly to distribute the weight. A truly good package is not carried, but is worn like a dress. First of all, you have to decide how much to buy. The capacity of the inner racks generally ranges from 40-120 liters. For the average traveler, a 65-75 litre bag is suitable for most long-distance travel. If you need to camp in the wild for a long time, if you belong to the kind of hard-core elements of outdoor sports, or you often move like a house when you go out, you may need a 120 litre, huh, huh. To be honest, most people don't need more than 100 liters. Moreover, in theory, the weight of each person's back should only be one-third of his weight. Too much stuff, only to know how hard it was when it was time. So, pack lightly, take a good look. Q: How should the piggyback system be selected? A: You can't just look at capacity and numbers when buying a package, but also how much of a suspension system you use. Before choosing the package, you'd better ask your family and friends to help you measure your torso length using a ruler (preferably a tailor's soft tape measure). This torso length refers to the distance between your seventh vertebra (the bone that stands most prominently at the junction of your neck and shoulders) and the vertebra that is parallel to your sacrum. The length of this trunk is in line with your inner frame needs. Do not assume that you should have a large bag on the back of a one-meter-eight, some have short legs and some have long legs. In general, if your torso length is less than 45 cm, you should buy a small package. If your torso is 45-52 cm in length, you should choose a medium bag. If your trunk is more than 52 cm in length, you should pick a large bag. Good manufacturers offer extra-large (56 cm or more) or extra-small (40 cm or less) bags, and they can also be tailor-made. The size of packages varies from manufacturer to manufacturer, and the package sizes vary from one manufacturer to another. You better be able to ask clearly, or find some information, it is not enough to measure the length of the internal frame. How can a backpack's belt fit? In addition to the above-mentioned inner frame, the carrying system includes a shoulder belt, a hip belt, and a chest belt (Chest Belt). Good manufacturers and distributors can replace shoulder straps and belts according to your body shape. In addition, because men and women are different in shape, good manufacturers have designed some backpacks for girls. The carrying system of these bags is specially made according to the physical characteristics of women. The sizes of the manufacturers are different. In general, the size of the belt is as follows: If your waist circumference (around the cheekbone) is less than 68 cm, choose a trumpet. If your waist is 68-78 cm, choose a trumpet. If your waist is 78-92 cm, check the number. If your waist is 92-106 cm, choose a large size. If your waistline is more than 106cm, choose extra large. As for the shoulder straps, there will be no gap between the adjustments and your shoulder blades (except for those with kyphosis). A good bag can arbitrarily adjust the weight distribution on the shoulder. You can adjust it according to your physical strength and environment. In short, good piggyback system adjustment is appropriate, and most of the weight (more than 60%) can be transferred to the hips and buttocks, so that your shoulders will be a lot easier and more flexible activities. Only then can you have enough energy to enjoy nature. Is there any stress on the function and material of the backpack? Talk about the material first, the general good package chooses the material such as 500D Cordura that is strong and can prevent a little water. Must choose the end of the super strength material. This is one of the most easily worn areas. It is best to use 1000D Cordura fabrics. To large YKK zipper. Although these things are too big to add weight, they are still quite solid. Bear the system must have good filling material, to be solid. It's so soft that when you carry more things, you're miserable. The filling material between the inner frame and your body can be slightly softer, preferably the kind of mesh that can absorb sweat. The inside of the bag is best with the kind of "StormCollar" that can be stretched. When you don't need to bring a lot of things, your bag looks very small. For example, a 95-liter bag might look like a 70-litre bag. Removable backpack cover. After you build the camp, something else can be placed in the car or camp, pick up the backpack, put the necessities inside, and you have a small backpack. A typical bag has a pocket with a sleeping bag. You can decorate anything else if you don't need a sleeping bag. Some bags can not only be filled from the top, the Front Pocket and the package itself. If you need to take things from under the bag after loading the bag, you can pull it off from the front pocket to get it. In addition, the water bottle pocket is also useful. It's best to have a function that bundles things. As for whether it can carry tripod tripods according to individual needs, most people do not have access to them. Drinking system Hydration System like to see personal habits and hobbies. Can you introduce a good backpack brand? After you determine the capacity you need, you have to select several brand styles, try one by one, and then confirm. If you can borrow a few backpacks from your friends, try out the best ones several times. Dana Design, Gregory, Arc[$DHZ_SingleQuotes$]Teryx, Osprey are well-known in the American market. In addition, Lowe Alpine, Kelty and The North Face can also be. European brands sell very little in the United States, mainly because of market promotion. Domestic friends all admire Germany's Big Pack, VauDe. In fact, the brand is not important, but many of us will inevitably go into this misunderstanding when selecting products. If the piggyback system is suitable and the workmanship is good, the grade and price are not important. Remember, what brand of "grade" is the package, and it is not appropriate to bleed the shoulders. How to pack a backpack to be comfortable? We talked about how to buy a bag for a long time. In fact, the most important thing is to pack the backpack. The inner rack bag is uncomfortable to back up if it is not properly filled. My experience is also inadequate, so it is best to have experienced outdoor enthusiasts design for you. In general, the back rack bag requires the body to tilt forward. This is also the drawback of the interior rack bag. After all, the body is very tired after a long time. However, a good filling method can solve or alleviate this problem. Generally heavy things should be placed near the top and close to the back, such as stoves, lamps. If you have a high center of gravity, you can straighten your waist. Cameras and lenses can also be placed on the top if they can be placed in a small camera bag. If you come to the area you can take it out. You put the sleeping bag and the clothing you don't need to change to the bottom, and other unused things are best placed below. Things that need to be frequently used are placed in side pockets, such as rain jackets, maps, compasses and the like. Heavy, dense stuff should be placed close to the body. The farther the weight is from the body, the more the torso muscles have to use more power to balance the torque of those things back to the trunk. It is very important that the weight distribution of the backpack is a factor of the total weight of the secondary backpack. This is actually why backpacks fit as much as possible. In addition, heavy things are labor-saving in the upper part, but where there is a need for flexibility (difficulties in climbing and skiing in areas where there is no road), it is more stable to focus on the lower body and the follower is better. It is generally said that 80%-85% of the weight of the burden transferred to the genitals is long. Shoulder straps should be suspended about an inch above the shoulders by means of straps and straps above the backpack. The shoulder straps are in contact with the body in front of the shoulders and on the chest, and the backpacks are not backed by shoulders. The problem of backward leaning on the inner frame is annoying. When the flexibility requirement is not high, I hang something on my shoulder strap. If you like photography, put all your belongings there, balance your weight before and after, and the camera is much more convenient. The map compass and snacks can also be hung there. Note that the weight of the front bag is on the shoulder strap. Because the shoulder strap is vacant, the weight of the front bag is the same as that of the main bag. D-glutamic acid is present in very low levels. However, in recent years, it has been found that D-glutamate also has an important role in some biological processes. For example, D-glutamic acid can promote neuronal growth and repair, and has potential for treating neurodegenerative diseases D-Glutamic acid,H-D-Glu-OH,6893-26-1,C5H9NO4 Mianyang Shengshi Health Technology Co.,Ltd , https://www.shengshiaminoacid.com