Form Function's handmade silicone 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 Model A - although their reservoirs appear to be the same. Designed to be worn with the Form Function Slingshot Harness, this packer fits up snugly against the urethral area for the purposes of peeing while standing.