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The most common extensions on the shoulder strap:
1. Dual use chest that can be used as a whistle
2, the shoulder strap is used to fix the water bag water pipe bayonet; personal feeling this is the best embodiment to examine the details of a backpack. Since the water pipe will keep moving with the shoulder strap during outdoor activities, if the buckle is fixed, it is easy to cause the water pipe to escape. Therefore, the careful manufacturer will make this a live buckle (there is a considerable difference between cost and workmanship and fixed type) so as to maintain its fixed position without affecting the use of the water pipe.
3, long distance walking, straps on the shoulder strap to reduce fatigue
4, the ring on the two shoulder straps for hanging various items