I have bought a few of these for our kayaking trip and they have worked great for three seasons now. These are loaded and go on every single trip because this is where I keep my required safety and water items.

https://www.amazon.com/KastKing-Waterproof-Military-Construction-Swimming/dp/B08ZYMXZR5/ref=cs_sr_dp_4?keywords=20l%2Bdry%2Bbag&qid=1676392187&sprefix=20%2Caps%2C123&sr=8-8&th=1&psc=1