Capacity - not just how much you can bring
Capacity is an important factor in choosing a backpack. The capacity is not enough. Hanging an item outside is both cumbersome and easy to lose. If the capacity is too large, the backpack is not easy to pack when it is packed. The equipment in the package will affect the balance due to movement. So, choose backpack capacity first to establish personal equipment list.
Here are some suggestions for reference:
1. A 20-30 litre backpack can be used on the day when you can make a round trip or go to the top of the mountain;
2. A 40-45 litre backpack can be used for overnight activities, mountain climbing activities up to 3 or 4 days, and mountain activities within 3 days;
3. 50-80 litre large backpacks should be used for mountain activities more than 3 days old and for more than 4 days.
Some of the equipment used in mountaineering, such as raincoats, warm clothing, and sleeping bags, are articles that do not diminish over time. They are relatively stable in size and weight. However, food and fuel are consumables, which decrease with the increase of activity time. The quantity of such items has a great influence on the capacity of backpacks. Nowadays, some backpacks use "elastic capacity" design, even if the backpack can still play solid after a few days of activity, it also makes this backpack can be applied to different areas of activity. In general, because the application of the small and medium size backpack and the backpack structure do not require this design, and no one has designed it in this way, the size of the bag can be adjusted by adding side pockets or adjusting the compression side.
The true elastic capacity design means that the backpack top can be pulled up or down and the backpack capacity can be adjusted from the vertical direction (the height of the backpack), or a backpack can be installed on the side of the backpack to adjust the backpack from the vertical direction (the thickness of the backpack). capacity.
Carrying the system - the skeleton of the backpack
The medium and large-sized backpacks usually form a piggy back system with the back frame as the center, and the back frame can be divided into two types, the outer frame type and the inner type frame type. 1. Outer rack backpack: This kind of backpack is often called "aluminum rack backpack". The material of the back frame is from early wood, bamboo, rattan, iron to modern aluminum alloy and glass fiber. Due to the high strength and light weight of aluminum alloys, this kind of back frame is the most common. The outrigger backpack is fixed on a hard frame, with a stretched nylon shoulder strap and hip strap. This kind of backpack is easy for loading and unloading of objects, and can make the weight shared by shoulders and hips. Since the outer rack type backpack is carried by the rack, the ventilation of the back is good. Although the framework can provide these benefits, but also because of this it makes it very inconvenient in certain situations: for example, when drilling in jungles, bamboo plexus; backpacks are easy to get hooked; easy to climb or skiing The center of gravity shifts out of balance. In short, the outrigger backpack is more suitable for the long journey to the flat road. 2. Inner rack type backpack: There is no obvious frame on the outside, and the detachable or hidden side pockets are used. The appearance is narrow and long, so the backpack is usually called "upright backpack." Upright backpacks have built-in aluminum frames, and hip straps can transfer some of the weight to the hips, which is the type most used by climbers today. Normally, the backpack's backpack system can keep close to the back curve, so it can make the shoulder, back and buttocks share the weight of the backpack at the same time, it is also more suitable for movement, and it is not easy to abruptly shift the center of gravity. In order to avoid back boring caused by sticking back, various manufacturers have also designed a variety of ventilation grooves, and even use breathable material as a back to improve this shortcoming. The simple and narrow appearance of the rack-mounted backpack is conducive to the towing of rock slopes. It is not easy to walk in dense trees and in the bamboo forest. This is also an advantage that the outer rack backpack does not have. Its big disadvantage is that it is not very convenient to load the items, but this can be overcome by good filling techniques. In addition, some backpacks are equipped with headbands that can distract some of the weight from the head. However, it should be noted that the use of the headband will limit the movement of the head. In the case of a good field of vision, it is better not to use the outer and outer racks. The outer racks have a higher center of gravity, about shoulders or shoulders. ; And rack-mounted backpack is slightly lower center of gravity, about adjustable in the shoulders and buttocks. There is no obvious difference in the physical exertion of the backpack's center of gravity, and the biggest difference is in the difference in perception and balance. In situations where you need to maintain balance, you should place the center of gravity close to the pelvis, which will prevent the backpack from shaking at shoulder height. Although the high center of gravity design is not suitable for applications that require a high degree of balance, it is more comfortable to carry the burden on a flat road.
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