So I bought one of these M-wave handlebar bags.
Pros: bigger than I expected.Waterproof material. Reflective strips. Very inexpensive.
Cons: no internal pocket, just one compartment. All black, reflective strips are small. Kinda floppy, it definitely sags forward. Handlebar bracket is intended for road bike gauge bars, I had the first handlebar bracket break promptly on me, the second bracket I filed out and mounted with inner-tube clippings because it didn’t come with accessories. Poor instructions.
Is it worth your time? Only if you have road handlebars and don’t load it heavily.
BTW: I bought mine from Amazon.com. That link above is the first place I found it. I don’t actually like the look of that site. Here’s an Amazon link.