Just add one Pac-It pouch to 11 oz of water and shake moderately-it's that easy to mix your own evolve field spray and save money with less waste. The #1310, includes 3 Pac-It pouches, makes 36 oz. of Field Spray when you need it, wherever you are. The Evolve Pac-It is another DDW market first and demonstrates our technology leadership in finding solutions for every hunting scent control challenge. Pac-It refills are ideal for the traveling or back country hunter when weight or space is at a premium.