The Day Pack 2X is truly the minimalists dream setup. The Day Pack 2X is truly the minimalists dream setup. Gone are the days when you were forced to decide between bringing enough flies to cover the hatch or traveling light. With Tacky's original, patented silicone anchoring technology and bi-directional slits lining both sides of the box, up to 360 flies fit right in the pocket of your wet wading shorts. Isn't compromise overrated? We think so. 5" x 3.125" x .75" Flies not included