This model replaces the female buckle piece on my Northface backpack. It may be compatible with other brands that utilize a 15mm strap as well.

It is printable without supports when printed vertically on its “legs” (the STL should be in the correct orientation by default when imported into your slicer). Alternatively, it can be printed on its back for greater strength, but supports will be required. If you are having issues with layer adhesion, this is not the model for you.

I recommend printing in PETG or ASA for strength, and with a minimum of three perimeters. A small brim maybe required for good bed adhesion.