This is a wonderful sling bag and a great alternative to a backpack. It has plenty of compartments to hold all sorts of stuff.
It can be worn like backpack across the back or towards the front to have easy access to the zippered compartments and the water bottle holder. The strap is switchable (by switching the clip to one side or the other) so I can either swing it right or left side.
The water bottle holder can also hold a small umbrella as needed.