I agree with pirate -- all boats should have a bow line rigged at all times.
-- It's a quick tow line if you need it.
-- It's a quick tie off for your boat.
-- You can tether with it (ex -- paddle or unexpected Drive removal)) or from it.
-- It can be used to lock your rudder control by slipping it underneath.
-- I use it on the Adventure as a paddle cradle to keep the paddle from cartwheeling (NA on the AI).
-- If you need it for something else, it's always available. If you're going to carry line, why not stow it in a ready position rather than in some pocket?
I've towed a lot of boats and kayaks. It's always unexpected and sometimes time is of the essence. It's very difficult to tow a boat without a bow line and not nearly as easy to rig quickly under duress.
Here's an example. This was a needlessly difficult tow against sudden "Santa Ana" local winds that came up -- two panicked kids adrift and abandoned by their Dad (who had evidently panicked also ???). Neither boat was rigged with tow lines. Not only was it tough for the first child (I thought she was going to let go), but was pulling my arm out of its socket while making rudder control difficult (awkward to operate with the right hand while struggling with marginal steerage due to a double side load and headwind). What a fiasco!!
What you least expect happens!