Easily Remove Tube or Carry in Holder Patent Pending The most versatile tube holder on the market. Setup takes just seconds and gives you the choice of creating a 15ml or a 50ml tube holder. Unlike other tube holders, the open uprights allow you to view the entire contents of the tube. No more guessing if liquid remains in the conical bottom. Tube can be easily lifted from the holder, or pinch the uprights and carry the holder with the tube. 4 per bag.