You make this look sew easy . Well I guess I know what the wife needs for Christmas.
Nice work and excellent looking bags. Question: have you given these sacks the dunk test? I took a fall that had me neck deep in cold water. Since that day I have employed dry bags and plastic bags to store everything in my backpack. I wonder how these sacks do when held underwater as zippers seem like a potentially leaky proposition. I have packed a variety of plastic bags in varying sizes and thicknesses from heavy trash can liners down to dry cleaning bags (doubles as emergency water condensation/dew still) and are nice and light. I tie an overhand knot to seal em...so far no leaks doing dunk tests in the pool. Have you tested your sacks? What was the result?
Looks great! Now get some material and get creative!