Day sling bag recommendations?

I'm looking for a smaller should sling for day trips when I travel.

I'm 6'5" and large--about 300 pounds, so a longer strap is a must.

I'd like to be able to hold my passport, a standard size bottle, sunscreen, a battery pack for my phone, and occasionally a compact travel raincoat that rolls up. Bonus points for some sort of zipper puch for coins.

I have a Pakt travel backpack and a Topo backpack for work that I love, but I need something smaller for this use case.