I bought this bag from Amazon https://www.amazon.com/gp/product/B09SY98SWY/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

It fits the measurements and I did a prepack thing and am able to fit a 37 x 52" blanket in there and toiletries and some spare room. I like the bottle holder it has too.