For small snakes in a shoe box size container, I just fold the paper towel. It fits perfectly. The snakes will usually go in between the layers, even when there is a separate hide.
For adult snakes, I use newspapers with 2 or three layers. I just cut about 4 inches off the top, and it fits perfectly in the 28 quart sterilite containers. Again, they sometimes go between layers, but some just stay on top. It's some much easier to maintain and and clean than when I used aspen, and feeding is a breeze in the tank.
Mark