Sound like an odd thing to have or use? I started making these little bags by hand awhile back during a bout with bronchitis or something. The one I hung on my bedpost held remote controls and a flashlight, but I decided it needed to be replaced with an upgrade. I wanted to work on attaching straps with a liner or reversible side today, so that's what I did.
First, here are some other bags I've made this summer.
The ones on either end are made from thrift store skirts that I just shortened and squared off. The extra fabric has been used for quilt piecing. The bag on the left still has the button and zipper on the other side, and the one on the right has a drawstring I made work by cutting the existing one in two pieces and attaching them together. Second from left is a bag I plan to use for used book shopping. Next, a gift bag made from one fat quarter, but I might add a liner. The next two are made from instructions for reuseable produce bags, also each from a fat quarter. I like the tab closure, but might make more that are a little wider and a little shorter.
These are called box corners. They give the bag a bottom, allowing it to stand square. More or less. If you can't see how it's folded, and would like more details, you can ask me or look for a tutorial.
Here I've tested out how the bags fit together before attaching the strap. I attached the strap at the sides, then sewed on the pockets, and then went all the way around the folds at the top to finish the bags together. Awhile back, I made the neatest charm square reversible purse, but the instructions for attaching the straps had me addled, and I couldn't figure out how to not have them sewn inside the bag. Doing it this simpler way was a relief.