For a chea---ah, er, an inexpensive alternative, check out some women's over the shoulder purses. They come in all sizes and configurations. I picked up several at a flea market for a couple of bucks each. One fairly large (black) and another smaller one (dark blue). Both made from a canvas-like material. The straps were about 1 1/2 - 2 inches wide and I then added a sheep skin seat belt pad to make it more comfortable.
While not made specifically for fishing, they have built-in features that lend themselves to that purpose.
Just an idea to try without breaking the bank.