Break the buckle on your backpack because your sister slammed the trunk door on it? Well here's a solution.
One end of the strap is held in place by a 6-32 screw and the other loops through and is held in place by teeth to make it adjustable. Can hold about 25 lbs. with a 4 perimeter print.
1) Insert 6-32 screw (head on the opposite side of the arch brace) through strap loop
2) Insert other half of the strap through the gaps in the sides of the buckle