That is most impressive, Vladimir. I especially respect the fact that you are able to right the boat, even while it is loaded.

Yes, 8" is a pretty large hole. For some reason I was picturing a 6" opening. Those bags are really neat and I must go check them out!

I have been using the Tex-Sport brand waterproof bags. If you have seen them, can you comment on the comparison of the durability of the canvas used in yours and in the Tex-Sport? I have noticed small spots on my bags, where they often bend and fold on the same line, are beginning to loose their rubber coating and beginning to leak a drop or two of water at these spots.

What I really like about those bags you have is that they have flat bottoms. This would be much more stable while underway.

I'd be interested in hearing more about your experiences in these catamaran camping trips. Some questions that come to mind, follow:

What is your choice of stove?
What hot foods do you find work out best for you?
Are you able to look into the bag opening and then grab what you need; or do you have to dump out all the bag's contents and then repack it each time you need an item from inside?
Do you ever have a problem with rain or dew?
Do you lay a tarp down on the tramp or are you able to place your sleeping bag right on the tramp? (mine would never be dry enough)

By the way, I understand the advantage of the float BoB! I recently did some capsize righting lessons on a boat that had one. Just make sure it won't leak and take on water because they can get very very heavy. The buoyancy that they provide is a great safety measure!