I made a backpack belt today to make sure said backpack stays a certain size.
I didn't have time to run out and find something like this with the slim hope that there might actually be something like this to be found anywhere nearby. Besides, I had everything I needed to make my own right here! The clip was rescued from a duffel bag that no longer needed it and the belt is made from a double layer of 1"wide single fold bias tape. Reinforced the end where the female part of the clip goes with an extra layer plus a bit of edge stitching later and, voila, I'm good to go.