I invested in the Watershed Colorado last year and I’m ready to switch over for a day bag. Doesn’t need to fit anything huge... sunscreen, a snack, book, some other random things, and maybe even my toiletries. Plus a small splash jacket if it’s a cold trip, but that’s not necessary as we usually carry a warm clothes bag. Essentially I’d like to fit everything I carry in the ammo. I have many friends who use them this way, but I can’t remember which size they have I’m having trouble judging online. What would you recommend? Ocoee or Chattanooga? Many thanks!!