Product review (5 stars): There are perfect for the drain hose of portable washing machines
There are perfect for the drain hose of portable washing machines.  It fits right over the end of the hose and the elastic keeps it on tight.  Once it's full of lint you can simply take it off, turn it inside out and pull off the lint off and reuse.  I couldn't believe how much lint had been going down my drain before I got one of these!