Form Function's handmade products feature a flexible but sturdy design, and have impressed us with their user-friendliness. That being said, we would still strongly suggest practicing peeing with a STP before using away from safer spaces, since having an unruly urinating prosthetic can be a severe safety issue.

The Model D Sport features a more compact design when compared to the - although their reservoirs appear to be the same. Designed to be worn with the , this packer fits up snugly against the urethral area for the purposes of peeing while standing. Made of .