Tracy, looking at your knives, I get the feeling you can make anything "work". I've been thinking about trying a stainless steel keg, like soft drink syrup is dispensed from in fountain drink machines. They have a fitting on top for pressurizing with C02, so I don't don't see why one couldn't be connected to a vacuum pump. They come in a 3 gallon (about 15" tall) and 5 gallon(about 24"tall) the top has a pretty large opening for cleaning, so if the wood is like most sizes used for stabilization, you could pack quite a bit in there at a time. This is only a thought, as I haven't done any research. My thoughts, are that the resins are so expensive, (and I don't know "working life" of the resins) that a smaller tank might allow less resin in a batch. The diameter of these kegs is about 8 inches. I used to make beer with them yrs ago, back then Cornelius( check spelling) made them. New from Brew stores they were $55, but they can be had much cheaper used from the vendors of the syrup. I just can't remember how the lid worked, if it was inside clamped to underside of keg top for positive pressure, it might not hold for a vacuum or negative force pressure. You see these all the time outside fast food places, a look at one will tell you if the lid is out or in.I'm not sure that at 29.8 vacuum it would matter either way. My worries are how long do the resins last after exposure to air, I know I can come up with a pressure "cooker" that will hold a vacuum, simply need to change a few fittings for the vacuum pump!