Problem with tie wraps is that they don't always close securely enough to prevent leaks, and untieing an overhand knot one-handed, in the dark, while your hands are cold-numbed is hard to impossible to do without loosing water.<br><br>I might put a higher importance on needing to be able to do things one handed and by touch, but I've spent a summer with my main hand in a cast, so I know first hand (pardon the pun) just how hard that can be.