Go to the kitchen section of Walmart, and look for the small water-tight snap lid containers. I usually grab about a dozen of the flies I intend to use for the day and keep it in one of these boxes. When I'm fishing, the box stays in the open of the boat or in my shoulder pack, so I can access it quickly without digging through dry bags etc. At the end of the day, I dump all the flies out and press them dry with a paper towel and let them dry out before storing them back in the larger fly boxes.
TW