As has been said, don't take that on the boat. However, what hasn't been said is another option instead of a mesh bag, like if you don't have one and it's super short notice (or too cheap). I have two other options: 1) any soft, folding bag will work. Mesh will just last longer. I had a 25 year old duffle bag my parents were about to throw away and made that my bag. My wife has a nice Oceanic mesh bag. They do the same job, but my gear has to be more dry before it goes up. Another option is what I call the "dive nugget." I haven't seen it taught or used since my OW course (besides when I do it), but I find it invaluable. Put your BCD on its back on the ground ontop of your weight belt. Lay your exposure protection on it, then regs, then fins last. "Close" up your BCD, then "close" up your weight belt....both as tight as you can get them. This is a nice, neat little pouch that can be carried around. I sometimes put the weight belt "head to waist" (perpendicular to the waist-strap of the BCD) and sometimes I'd do it parallel to the waist strap of the BCD, depending on how that particular pack went. This means you have ZERO bag to worry about. Even if you get a bag, practice this a couple of times because you might find the need to improvise, and it looks like you're a PRO when you get done with it!!
As for tipping, my standard is $0 if they sucked and/or did NOTHING or if they meddled with stuff that I don't want them touching, and asked them not to touch. $5 if they did a little bit, were definitely helpful, and were friendly. $10 if they were over-the-top fantastic. A more expensive charter will also get higher expectations from me, as I expect better service for the more expensive price.