Originally Posted by headchange4u
That's a great idea. You would have to make sure the grommet is large enough for the bite valve to pass through.
Another method you could use would be to have overlapping folds of fabric, like the way a pack's hydration port is made.
Everytime I go hiking...I have these crazy invention ideas pop into my head. This was one, and I also thought about some type of removable boot sole that could be clipped on/off the bottom of trail runners, so when hiking in rocky areas (PA for instance) you could have more support and foot protection from sharp edges/rocks, but then remove them when not needed, and still have the blister-forgiving/quick drying fit of a trailrunner. I thought you could have them attach like the Step-In Snowboarding Bindings (see pic)