I've been wondering about this for a while now and haven't been able to figure it out yet.
How are long distance swimmers able to hydrate? I can't remember ever seeing anyone do an Ironman swimming leg with a hydration pack or water bottle.
Also, how do you guys hydrate when running longer distances (not during competition with water stations)? I've tried running with a small backpack and with water bottles, but it's not exactly comfy.