Okay, I keep getting questions about how to use these -- here are some answers -- please read this first before you send me a PM.
1. The Unidrum tubes have built in separators that keep the sheets in place (for 4x5 or 5x7). These separators allow you to do 2 sheets at a time, either size; to do 4 sheets of 4x5 in one tube, you need to adapt an eraser or a chip bag clip or something like that which will keep the bottom pair of sheets from overlapping with the top pair.
2. The film gets loaded in the tube in a darkroom -- I use my bathroom, which has no window. Once the lid is on, the tube can be removed from the darkroom. Daylight process in your favorite area, near a sink.
3. Yes, you CAN hand roll these tubes -- they are designed to be used either by hand or on a motorized agitator.
4. There are SEVERAL threads here and at LFF which discuss how to use tubes / drums for film development: do a search for Unidrum or Unicolor and you will come up with plenty.
Sorry, I don't have time to answer every single question regarding how to use these tubes -- but it isn't that hard, believe me. Just do a little research and you'll see what I mean (if you haven't done your own processing before or have always used trays).
Thanks --