For those who have not experienced a loved one going through the cancer journey which I have now done twice unfortunately. The drainage bags i think they are referring to is when my dad had surgery to put a stent in his bile duct which was blocked they put tubes into the body which are then attached to a plastic bag outside the body. I think the bags they are making are to hold this plastic bag as some of the stuff that comes out is not pretty and also to help when they are walking around etc..