Re: How many covers do you put on?
convenience. Same reason lots of people don't cover a boat, especially during the "season." covering a moored boat is especially a pain. so would be moving around an open bag of charcoal.
I don't think that a bag of charcoal will do much on a weekly basis anyway. In a bucket, you only have the top surface working. The open bag is more surface, but a mess to move more than once in the spring.
Along these lines, those silica packs that come in electronics and say, DO NOT EAT:
Get them out of the stew pot and put them in tackles boxes, glove compartments, or other closed small areas in the boat and your equipment. After a year, then you can eat them.