1. Adjust to the appropriate shoulder strap length
Adjust the shoulder strap length of the pack according to your height, but not too long. Try to keep the backpack close to the back, keep the bottom of the backpack flush with the waist, and make the backpack in a relatively stable state.

2. Make sure your posture is correct
Also pay attention to the posture of the back when carrying the backpack. When many people carry a single shoulder bag, the shoulder strap slips off, which may be because of the wrong posture. When carrying a pack, keep your waist as straight as possible so that your back is flat on the pack. Do not bend over, this will cause a gap between the shoulder bag and the waist, which will cause the shoulder straps to loosen and slip easily. If it still slips, you can gently hold the shoulder strap with both hands to prevent the shoulder strap from slipping due to loosening.
3. Hidden adjustment buckle
Some bags will come with Dual Sternum Strap Adjuster, in the middle of the shoulder straps on both sides. When carrying the pack, the buttons snap together so the straps don't slip off. If you don't have a backpack, you can add two Dual Sternum Strap Adjusters to the repairing place, which will be much more convenient.