What kind of carrier is this?

[maple_leaf_eh]

The main strap is one piece , with a short loop 26 1/2" extremity to extremity. The long loop is 53 1/2". The straps are riveted with 5 nonferrous pins. The heads are flush inside and capture washers on the outside. One end is folded and riveted, the other end is triple-layer with the tails trapped.

The third picture is just a tape shown for reference. The tape is just laying there arbitrarily.