When you buy a bag, you should not only look at the capacity and number, but also look at how big the carrier system you should use.
Before choosing a bag, you'd better ask your family and friends to help you use a ruler jqk and measure your torso length with a tailor's soft tape measure. This torso length refers to the distance between your seventh vertebra, jqk, the most prominent bone where your neck meets your shoulder, and the vertebra parallel to your hipbone. This torso length is consistent with your internal frame needs, do not think that you should carry a large bag with 1 meter 8, some people have long legs, some people have short bodies and long legs.
Generally speaking, if your torso length is less than 45 cm, you should buy a smaller bag. If your torso length is between 45 and 52 cm, you should choose a medium size bag. If your torso length is more than 52 cm, you should pick a large bag.
Good manufacturers provide large jqk56 cm above or special small jqk40 cm below the bag, but also can be tailored. The size of bags varies from manufacturer to manufacturer, and even different series of bags from the same manufacturer vary in size. You'd better ask, or find some data, or measure the length of the internal frame if you can't.
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