It can be filled with sand. The bottom of sandbags in the museum will be filled with sand, and the middle and upper floors will be mixed with sand, cotton or cloth. If you need sandbags, shake them less or be harder. 60% sand and 40% sawdust, or 70% sand and 30% sawdust.

Some sandbags are hollow and some are solid. Hollow sandbags need to be filled with some items, such as sawdust, shavings, sand, rags, old clothes, silk cotton, wheat, corn and beans. It is suggested that sand should be bagged separately, and it would be better to put some rags and old clothes in the middle of sandbags.

Extended data:

Boxing is good for keeping healthy. The results show that the constant movement of abdomen, waist and buttocks in boxing can not only fully burn the excess fat in the body, but also shape the muscles of various parts of the body reasonably and effectively. Make it perfect.

Modern people who work in front of computers for a long time. Back and neck often feel sore, and boxing has a special health care function for those who work at their desks for a long time.

Because this sport requires a high degree of concentration, you can learn to control your emotions, not be impatient, and your sleep situation is obviously improved. It can also regulate human endocrine.