Hey all, so I thought I'd try to make a contribution to the forums by posting instructions and pictures for making what I like to call the Can-Can. It's basically just a place to stuff your empties on the river. However, the same technique can be used to help secure a 5 gal bucket in a boat. Much cheaper than the special harness made for buckets and seems to work pretty well, although admittedly I've never flipped a boat to test it.
You will need:
1 Home Depot (or similar) 5 gallon bucket
1 Lid for said bucket
1 4' cam strap (can be ignored or substituted)
1 6' cam strap (can be ignored or substituted)
1 utility knife
1 dremel tool (or previously mentioned utility knife and patience overwhelming)
That's about it. It's a really simple procedure and you can do it in less than 30 minutes.
More pictures of this process are posted on Flikr
First: Take your lid, trace out a pattern similar to the opening on a beer can, but larger. Cut along this trace pattern. You should end up with a lid that now has a flap in it.
Now, you can stop here if you want. The only thing you have to strap the bucket in is that cheesy handle at this point though.
Part Two: To make this bucket, or any similar bucket more river worthy, take the handle and remove it from the bucket. This is pretty easy but may take a little strength to bend the hooked ends out of the handle holes. Once the original handle is removed, take your dremel and cut out slits, about 1" wide, in the plastic part where the handle attached. You will make 3 cuts on each attachment point, left side, top, right side. The bottom of the tabs are already open. Take care to center your cuts as to leave the most material possible in place at the corners.
If you want to, and I kind of recommend it, flip the bucket over. Cut another 1" notch in the bottom lip of the bucket, being very careful not to cut INTO the bucket. You just want to remove the lip directly beneath the former handle attachment points.
Now, take your 4' strap and thread it around the bucket and through the left and right side cutouts.
Do the same with the 6' strap except this one goes down through the top cut outs and around the bottom of the bucket, fitting into the notches you cut in the bottom lip, then back up through the opposite side's cutout.
That's about it. Now you can strap this bucket into your boat and it will stay in all but the most extreme situations (ideally).
Now, while you're on the river you can drop your empty cans into the bucket rather than have them take up space in your cooler.
I have also done this with a couple extra buckets and instead of the regular top attached a gamma lid on it.