I want a one should strap backpack. This. Budget is $30 but i would prefer it to be around $20. Buying from US. From what i can tell 8 liters.

Its either called sling or crossbody. Im not the smartest when it comes to what you call it. All i want is a one shoulder strap backpack not a fanny pack looking thing. I just wanted to give that a shot rather than get a small backpack like 8 liters. I want this not something like this. I could just get it off amazon but i wanted to check with you guys to see what brand you guys recommended.