Winchester Sutler carries tubes. I have some for my pistols and some for my rifle. I found that they had a static cling to them that kept a small portion of powder stuck to the inside. I was told I could rub them with a dryer sheet or something I forgot, but I never did. They've just sat there.
http://winchestersutler.com/ShotLoad.html#QCTube[/quote]
I've been using the soft tubes form the Winchester Sutler and others for musket and revolver over 25 years and never had a problem with static cling. My wife uses them too and the only thing we do is wash them after every use and after they are dry put them in a coffee can, add a little baby powder and shake so they get a light coating so that they are a little less likely to stick to each other in the tins we transport them in.
I use a filler in my revolvers and this is the procedure for preparing premeasured charges and loading. I take a .58 cal. (red) tube and drop the powder in it from a measure. I then insert a .44 cal tube (yellow) into the .58 tube base first and this is where the baby powder comes in. The filler is dropped into the yellow tube from a measure and the ball is inserted in the mouth of the yellow tube. To load pull the red tube off the yellow one, squeeze the sides slightly to form a funnel and pour the powder into the chamber. Slip the .58 tube back on the .44 tube and squeeze the .44 tube just below the ball to pop it out. Pour the filler into the chamber and set the ball on top. The two empty tubes go back into the tin container (I use the Maxwell House International latte containers) and under the shooting bench till the match is over. This system is reasonably watertight and I've stored prepared rounds for a couple of years without a problem. For a .36 you use the .44 (yellow) tube for the powder and a .36 (white) tube for the filler and ball. Of course if you don't use a filler all you need is the correct tube for the caliber you are shooting.
