How should the piggyback system be selected?

You can't just read the capacity and number when buying a package, but also how much of the 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.