The carrying system is responsible for combining the backpack with the back of the human body. Its main functions are two: First, the weight is distributed to all parts of the body, avoiding only focusing on the shoulders, so as to achieve the "good back" effect; the second is to provide the center of gravity adjustment to ensure the balance in walking.
Medium and large backpacks usually consist of a backpack system centered on the back frame, and the back frame can be divided into an outer frame type and an inner frame type.
Outer frame: The outer frame backpack is attached to a rigid frame (the most common aluminum alloy) with a tensioned nylon shoulder strap and hip strap.
Features: The center of gravity is high, about shoulder or shoulder. The high center of gravity design is not suitable for applications that require a high degree of balance and is suitable for carrying on a flat road.
Advantages: easy to load and take the items, and the weight can be shared by the shoulders and hips. The back is well ventilated.
Disadvantages: Practical inconvenience in different situations of the framework. When drilling in the jungle or bamboo groves, the backpack is easily caught and stuck; when climbing or skiing, it is easy to shift the center of gravity and lose balance. Therefore, the outer frame backpack is more suitable for long-distance travel on a flat road.
Inside frame: wrapped in nylon fabric inside the body, the principle is the same as above.
Features: The center of gravity is slightly lower. It can be adjusted between the shoulder and the hip. Suitable for climbing situations where balance is required to prevent the backpack from shaking at the shoulder height. Advantages: Comfort, stable center of gravity; free movement, reasonable weight distribution. Disadvantages: The storage space is relatively narrow, pay attention to the reasonable allocation of space when loading, close to the body, slightly poor ventilation, relatively hot.
The part that transfers the weight of the backpack from the shoulder to the hip is the most critical part of the entire carrying system. Usually, the bigger the load, the wider and thicker the belt should be chosen (but for the rider, it is definitely not recommended to carry a backpack that is too heavy when riding). Belts are usually padded, inside and outside the belt, fasteners, straps, waist pads, and enhanced load-bearing structures. Among them, the most important indicator to measure its pros and cons is the padding. The high-quality belt is usually padded with soft and thick foam to better fit the buttocks, so that the wearer can keep the upper body straight, even if walking for several hours. Not tired.
3, inside and outside the belt
Simply put, it is the part that wraps the pad, and the waistband is exposed on the outer layer. Due to the natural wear resistance of nylon, most backpacks use this fabric to make the inside and outside.
Most of them are trigeminal lobster clasps. The advantage is that they are strong and easy to use. The disadvantage is that they are easily trampled or crushed. Therefore, if it is a long-term outdoor activity, you can consider carrying a spare buckle.
Also called the belt stabilization strap, the backpack fits the hips more tightly and increases stability. Most of the inner bracket backpacks have this structure, and some have diagonal straps to further transfer the weight to the waist.
Most of the inner frame backpacks use this design for the additional support of the back waist. The waist pad is too hard or too soft, and it is easy to cause a sore waist when the weight is negative.
7. Strengthen the load-bearing structure
For backpacks with a heavier load, an intensified load-bearing structure is usually required to avoid distortion when subjected to force. Most backpacks are supported by a thermoplastic foam that wraps around the body and is not easily deformed. According to the combination with other parts, there are two types of belts: structural continuous type and sewing type. The former usually passes between the waist pad and the body of the backpack, and is connected to the waist pad by a hook and buckle. The stability is excellent, and most top backpacks adopt this design. The latter is stitched in two backpacks.
Prevent the backpack from leaving the body, the parts that fall back, and also take care of the load. The vast majority of the shoulder strap gasket material is foam and the style is an inner curved curve design. The key to determining the comfort of the shoulder strap is the width between the bases of the two shoulder straps. Some backpacks can adjust the width of the shoulder strap, or change the shoulder strap according to the body shape
Also known as the shoulder strap tightening strap, it is designed to connect the top of the body and shoulder strap. Its function is to bring the backpack closer to the body, so that the user does not feel that the backpack is tipping over, and can also transfer the weight bearing on the muscles of the shoulder to the collarbone. Most of the load-bearing straps are sewn to the shoulder straps. The best effect is that the load-bearing straps are at an angle of about 45° to the top of the shoulder straps.
10, chest strap
Attached to the shoulder strap by fasteners or stitching to prevent the shoulder strap from slipping off to the sides and remaining stable. Most chest straps are made of a flat belt structure, and some parts are added with an elastic material to prevent shrinkage when tightening. The position of the chest strap is preferably that the upper edge is flush with the base of the neck to minimize compression on the chest.
11, pad and back cloth
Located on the back side of the belt to prevent irregular items from squeezing the back. Typically, most internal stent carrying systems use a large area of thermoplastic foam as a liner, which is then wrapped in a mesh fabric to help accelerate the evaporation of sweat or moisture. The outer bracket type backpack will use a horizontally stretched back cloth to prevent the bracket rail from sticking to the back and causing discomfort. The material of the backing cloth is generally also a mesh cloth with good air permeability.