Your Hobie Adventure should float regardless, but if you want extra flotation inside, making it a combo storage bag wont give you the flotation you need should the hull completely breach (unlikely). Pack light and install regular flotation bags fore and aft.
As a guy who picks up the un-cautious for a living, I can add a few things that most don't think enough of:
(I am putting aside the obvious items like a constant wear PFD, etc.)
1: A very detailed sail/paddle plan..left behind with someone you love / trust.
You want a detailed plan/schedule that includes. Where you are going....when you will be where...when you intend to leave. Possible bail- out points. What equipment you have with you. Your cell phone number (if you are carrying)... You need to think like a rescuer and write down all the stuff you would want to know if YOU had to go look for yourself. This should all be on a single page, easily faxed to the Coast Guard.
Leave instructions with the person who is watching out for you...WHEN to call the coast guard and WHERE to send it. Already have the fax numbers of the Coast Guard ready for them.
Include a detailed description of your boat, Your clothing, You (35 yo White male, 185 lbs etc.)
A detailed and useful float plan is almost always overlooked. We usually get...."My husband wnt out Kayaking and he isn"t back yet!" Us, "Where did he go?" Wife, "on the ocean!"
2. Stick with your plan! Be flexible if you need to....but contact home base with any changes.
3. Stay in touch whenever possible.
Cell phone....vhf radio (a must have safety item) and .... VERY IMPORTANT and worth EVERY PENNY...A 406 EPIRB in your vest! Worn ALL THE TIME. Yes, I know they are 500 bucks plus. Trust me, when you see the helicopter looking for you but theey are too far away to be seen...you will wish you had spent the money.
If the 20 miles between Catalina and the beach has cell phone coverage. Check in with home every hour. If there are dead spots, You would be better off calling just before you leave with your expected return time. Call as soon as you hit the beach.
Remember...as soon as you are out of your boat and in the water...the water is trying to kill you and it is very good at it. The FASTER you get out...the better. Float plan alone: 36 hours is fast. Float plan and 406 EPIRB. 2 hours is average given your distance from shore. Your vest should include (at the very least) the EPIRB and (the all time secret best signalling device made) a flashlight. Waterproof: Pelican lights are my favorite. Point your light at a helicopter and shaking it back and forth is the international signal for "COME LOOK AT ME" to all Coast Guard aircrews.
Another great piece of low tech gear to have with you is a rescue streamer.
5. Know where you are. A handheld GPS (more money I know) is well worth the investment. (duh?)
Listen, I hope this helps. Its a little long winded and maybe very obvious, but I never find people that are this prepared. Why? They are far to prepared to get into trouble, and usually don't.
Safety at sea is easy....think.
You are doing a circumnav of Catalina. Have fun. But that is what you are doing...it is NOT WHERE you are going. Where you are going is this:
You are going to surround yourself on all sides by something that will not sustain human life and if you get in it, it will slowly try to kill you. (thats the ocean).
Remember WHERE you are going...and then prepare for WHAT you are doing.
Mario / CGRS
http://www.opticsplanet.net/pelican-mit ... light.html
CGRS â€“ Chesapeake VA â€“ a coast guard rescue swimmer â€“ reposted with permission.