Backpack takes you on a cool journey.

Whether you're hiking through Qian Shan or going through towns and villages, there's one thing you need to travel, and that's a backpack. In my impression, travelers look like people carrying heavy bags in a hurry, and there is something cool in their clothes. Do you want to make your trip "professional" in the coming holiday? This issue of "Self-help Tour" will tell you the knowledge of choosing a backpack.

■ backpack classification

Usually, there is no bracket in small backpack, and a bigger backpack has a bracket to make people feel more comfortable. Brackets are divided into outer brackets and inner brackets, so backpacks are also called "outer frame bags" and "inner frame bags".

The "outrigger bag" divides the space for carrying articles into several places, so that backpackers can easily place all kinds of articles and adjust the position of the center of gravity (usually the center of gravity of outrigger bags is relatively high). At the same time, there is a certain gap between the outer bag and the backpacker's back, which is convenient for air flow and keeps the backpacker's back dry. In addition, backpackers can also use external brackets to fix other objects conveniently.

The "inner frame bag" was originally designed for climbers. In order to make the upper body more flexible, it is narrower than the outer frame. The design of "inner frame bag" makes the backpack more closely combined with the body, which is conducive to maintaining the balance of the body, so it is more suitable for rugged mountain roads. The disadvantage of "inner shelf bag" is that there is less space separation and it is more troublesome to take things. It is necessary to reasonably arrange the placement position and center of gravity of things according to the itinerary plan, so as to avoid turning out all the things in the backpack because things are needed on the way.

■ Packaging and use of backpacks

Firstly, the position of the center of gravity is determined according to the travel characteristics. If the road is flat or uphill, we should raise the center of gravity, if it is downhill, we should lower the center of gravity. Secondly, consider the items that may be commonly used during the March. These items should be placed as high as possible. Usually put the sleeping bag at the bottom, and then put other items in the order of use. When placing, place a relatively heavy object on the side near the bracket, so that the center of gravity can be closer to the back.

■ How to choose a backpack that suits you?

The size and type of backpack needed should be determined according to the purpose.

A backpack of about 25 liters is enough for a day's outing, while a long-distance trip or camping for more than 2 to 3 days may require a backpack of more than 45 to 70 liters. Generally speaking, men choose backpacks of about 55 liters, and women choose backpacks of 45 liters. If it is used to climb snow-capped mountains, it is necessary to consider whether there are ice pick hanging rings and crampons/bags on the backpack; A backpack with a water bag device can provide great convenience when traveling in summer or dry areas. Equipment manufacturers will produce backpacks with various functions according to different needs, and you can ask the equipment store in detail when purchasing.

In addition, before choosing a backpack, you need to measure the length of your back and upper body (that is, the distance from the cervical vertebra to the last lumbar vertebra). If it is less than 46 cm, choose small backpack, 46 to 5 1 cm is suitable for medium backpack, if it is greater than 5 1 cm, choose large backpack.

20 to 30 liters of small backpack can be bought in shopping malls and supermarkets. Generally, backpacks over 45 liters need to be purchased in a special outdoor travel store.

At present, there are not many backpack brands in the domestic market, such as BIGPACK, OZARK, NIKKO, PROGIANT and VAUDE, which are suitable for different types of travelers.