Assuming you've got all the first-aid and pin kit stuff taken care of, I would add some plastic and/or bitchethane and such for an emergency patch. Maybe one of those ultralight survival blankets that folds super small (like 2 square inches). Supplies to build a fire. CPR Mask. Etc.
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"The world would be a better place if everyone kayaked."-Brad Ludden (Valhalla)
"You only get one chance to run a drop blind."-DD
Astral rescue vest (I only mention this one because everything below fits inside nicely)
On my person:
Short 45' spectra throw rope in the vest
Two pulleys, a locking biner and 20' webbing loop made into a belt around my waist.
Three prussiks in the vest
Two biners in the vest
This list gives me an entire pin kit on my person. If you don't plan on unpacking yours and carrying it with you on every scout, then it should be on your person. Scouting is when they tend to come in handy as you watch your buddies pin and then start screaming about how you have a full pin kit 200 yards back up in your boat (personal experience). Also, it's handy if you swim to have a rope so you can set safety for your bros even without your boat (wouldn't know - never swam).
In the boat:
80' full size spectra rope with a biner
Another long loop of webbing with a biner
Break down paddle
CPR mask
Duck tape on the paddle
oxycodone for popped shoulders and such (makes hike outs more tolerable)
Gauze (way more absorbant than your t-shirt)
Epi-pen
Benedryl
Lighter x 2
Large pieces of bitchathane
I would also recommend a rapid air tube
The rest generally can be improvised. T-shirts and duct tape will make a reasonable sling. Breakdown pieces work great for splints.
If it's a long day or over nighter I add a head lamp and space blanket.
I will mention that if you're gonna carry an epi-pen or benedryl, you better know what you're doing. Also posession of oxycodone without a prescription is a felony. Watch out with super glue any where near someone's eye. It runs before it dries, but I have heard there is a gel out there.
Joe
Joe, do you carry all that stuff every time you paddle? It must weight a ton. That makes me feel very irresponsible. Perhaps I should.
Also, don't you worry about having webbing around your waste and no quick release? Everybody swims sometime.
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I hope in the future Americans are thought of as a warlike, vicious people, because I bet a lot of high schools would pick "Americans" as their mascot. -Jack Handy
BSOE, every time I'm in my creek boat I've got it all, which is about 95% of the time. In my play boat I generally just take the long rope, but I'd take more if I spent more time in the play boat. I always have the pin stuff on my person whether I'm rafting or kayaking. As for the daisey chain it is a concern. I always use the locking biner and keep the chain pretty tight to help prevent snags. My skirt is more likely to snag though and there's nothing to do about that. I forgot to add - very important:
KNIFE - I've got personal stories and have heard more and seen more on video of lives that were saved or could have been with a knife. Wigston recommends one zipped into the vest as backup and one easily removed from a sheath. The knife is handy in case of anything snagging.
As far as swims, it seems that BSOE, you remain the only person who can adequately convey sarcastic humor via the buzz.