kayak emergency breathing tube for practice rolling
a tube running under your spray skirt allows you to breathe out of the hull of your boat while you are upside down. this has a variety of obvious applications.
here is what i use: unidirectional accordian snorkle mouthpiece attached to 2ft piece of 1" diameter tygon tubing. i also use a scuba mask. put mask on and mouthpiece in mouth, flip over, quick exhale to push any water out, then breathe. try this with a spotter in a pool. you should find that you can see (with mask) and breathe (with tube), adding to confidence and orientation and reducing the need for wet exit.