3x barrels 19x14 can be a popup of load them with putty to sit them on the deck.
hydroponics material on the inside that will take on thin liquids
remember this will affect buoyancy, so if fishing as popups load them up before balancing with your chosen liquid for a couple of days using a 10ml needle bottle before balancing with putty.
if you want to fish them with no flavours let them soak in water beforehand.
