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I based my attitude on experiences with waterbeds in the 70's. ;)

I'm sure a bladder could work fine but I have a problem with having a big plastic bag of sewage on my boat. :)

Pretty much what I had in mind

I'm assuming that was intentionally not in purple font - a gravity drain holding tank does just that - it's mounted above the waterline and can be drained by simply opening a valve on the bottom of the tank which is connected to a through hull - no pumping required.

It looks like polyethylene is the consensus. I'll have to have one built though to fit the area I want it. It has to go here leaving access to all those fasteners and with the head inboard of it. Luckily it's not a cruising boat so a big capacity is not a requirement. Looks like a 3D cardboard...

Is there any consensus on the best material for holding tanks? I'm going to be installing a head system in a boat that has never had more than a bucket and I'd like to make the tank a gravity drain. Is foam core glass/epoxy good or is metal better for this? If metal, alu or S/S?