I need to get me a label maker. It's hard for me to tell which one of my 6 Plano boxes is what. Haha, kayak problems.
I fish a lot from a Frog Boat (I don't get as wet as you do, only difference); I use a plastic (office max again) file box that is perforated all over; i set the boxes i want in 2/3 of the box and set in the boat.
Then, I have 3 'cinch sacks' (like what the kids use to take clothes for PE) and put different themes in each sack, and i use a different color sack depending on what is in there (Swim vs. Senko vs. Creature), so i always know when i reach in that it is full of senkos/etc.; When it is time to load or unload, i just grab the box and i'm off.
IF something was hot, then i re-stock from the peg board once i get home; if it was a dud, i take out all but 1 bag of that soft plastic from the sack.
You could easily do same thing in Kayak with some bungee, etc.