Located on the soft underbelly of the Banjo Brothers Twin Saddlebag Pannier, this retention strap is critical to the operation of the bag. Fail to attach it at your own peril. Extremely hard to lose or damage, but you my friend are the elite of the elite and need a replacement. Fear not. We have you covered. For just four bucks we'll pack it up and ship it with all the love we can muster.