Because the function of backpack lies in its ingenious design, there is nothing harmful or dangerous to children.

Suspension doesn't really use something to suspend it, but uses a clever design to make the backpack smaller up and down with people when they walk.

When a person steps out of his legs, the backpack descends with the position of the human body off the ground. Stand up when you retract your legs. If the amplitude of each step is 10 cm. Walk 2 kilometers, and the distance is about 800 meters. Only the sum of the upward distances, 400 meters, is equivalent to lifting the backpack to the height of 100 floor. It is said that a good suspended weight-loss backpack can be reduced by 82%, and the 100 floor is reduced to 18 floor. )

But the price of this kind of bag is very high, only 50% is reduced to 500 (there seems to be no more weight loss on the market).

Moreover, this bag only reduces the burden of walking up and down, but it can't reduce the weight of actual items. In addition, the bag itself is heavier than ordinary bags, and it is not for long-distance walking and carrying heavy objects, so this bag is not used.

In other words, the tie-rod schoolbag is more suitable than this! Unless you go to school, you can't slide with a tie rod in many places.

It is more suitable than the tie rod 100 times, but you don't need to bring a book. Teach children to plan well, what homework they have in the evening, what materials they need to bring, what to plan to preview or review, and only bring what they have to take home. Prepare two sets of stationery at home and school, just take a pen with you on the way, just in case.

Don't use a thick notebook, because children have more subjects and many books are heavier. Use exercise books directly as notebooks, record dates and subjects on the cover, remember all the books and put them away, and form the habit of taking notes. In this way, you don't have to look around for information. Each subject only needs to bring a thin recent notebook and test paper. If the child's exercise is the kind of thick one that he bought himself, it is suggested to disassemble it directly and divide it into four or five parts with staples to make a small one. This kind of thing is useless after it is basically written. There is absolutely no need to save it like a valuable book, let alone save it after it is divided into small parts. In this way, the child will lose a lot of weight.

This is easy, but it is also a good study habit.