https://www.amazon.com/dp/B0BVVTFQNB?psc=1&ref=ppx_yo2ov_dt_b_product_details
I am always on the hunt for fairly priced functional stuff, and looking at the insane prices for a "motorcycle handlebar bag" led me to look at the cycling world.
Just got this bag in today and it works great on my WR250R, and I presume most dual-sports.
Time will tell how well it holds up, but for $20, I think I will easily get my moneys worth.
I might have to order a couple more as they can be mounted just about anywhere, and are of a quite useful size.