The MUDS has three primary features that work together to prevent spilling of urine and make it a spill proof male urinal.

The primary feature is that urine does not stay in the MUDS receptacle.  It drains in the container that holds up to 2500ml of urine.

The second feature is the design of the receptacle itself in that it is a chamber within a chamber.  It works similar to a liquid laundry detergent cap by preventing the urine from flowing back out of the container once the urine is in it.

The third feature is the “drip lip” which prevents dribbles of urine from spilling back on to the male during or after use.