The Pro Tec BP-STRAP is a deluxe backpack strap that converts your shoulder or hand-carry case into a backpack.
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Comments about Protec BP-STRAP Deluxe Backpack Strap:
These backpack straps are an excellent edition to any Protec instrument case. They are easy to install, very comfortable, and of an excellent quality. With these straps on my trumpet case, I feel like I am carrying half of the weight that I carried when I had a normal shoulder strap. I would definitely recommend these straps to anyone that is thinking of purchasing them.