Number One STP: Handmade Platinum Silicone STP

Discreet shipping on every order. Your order ships in a plain, unmarked box. No logos, no product names, nothing that reveals what's inside. The shipping label won't mention Transguy Supply or any product details. Learn more

Go at your own pace.

A handmade STP from Number One Laboratory, a small studio that's been making STPs for our community for years. A wider shaft opening means you don't have to hold back your stream. The soft powder finish on the platinum-cured silicone cuts the sticky feel, so you can skip daily powder.

Details + Measurements

Length: 6.25"
Cup length: 3.25"
STP height: 2.25"
Cup width: 1.5"
Shaft circumference: 3.5"
Material: platinum-cured, body-safe silicone with a soft powder finish
Boilable

Each one is made and checked by hand. The narrow bowl keeps it compact enough to pack every day. It's a similar style and shape to the Transthetics EZP, for a lot less. Number One Laboratory used to be called Form Function.

It's firmer than our TGS soft silicone, so a snug harness or STP underwear helps keep it in place. It was made for Number One's own Slingshot Harness, a low-profile thigh harness with no waistband. It also works with a Cake Bandit harness, or STP briefs, STP boxer briefs, or an STP jock with a working fly.

Choosing a tone: it comes in Light and Medium. Medium is closer to a light tan, so if you have lighter skin, pick Light. When in doubt, go lighter.

Want something softer that bends more, with a 3-in-1 option? See the STP Freely.

First-Time Tips

Every STP handles a little differently, so practice at home before you use it out.

In the shower with the water off and no clothes, so you can spot any leaks.
Over the toilet with no clothes, to learn where the cup goes.
In a harness or STP underwear, which keeps it where it should be.
Fully dressed. Once you're staying dry every time at home, you're ready for the urinal.

More in our STP guide.

Care

Rinse with hot water and soap after each use, or use our packer & toy cleaner.
To sterilize, boil it for 3–5 minutes, soak it in 10 parts water to 1 part bleach and rinse well, or soak it overnight with denture cleaning tablets.
Let it air dry completely, then store it somewhere cool and dry, out of the sun.
Use water-based lube only. Silicone lube can break down platinum silicone over time.
Before longer-term storage, finish with a light dusting of Packer Renewing Powder to keep the soft finish.

Discreet Shipping

Orders ship in 1–3 business days in plain packaging from our shipping dept., with no logos or product names on the outside. More on discreet shipping.

Packers and STPs are final sale, and so are all international orders. International customers cover local taxes, duties, and customs fees. Return policy.

Number One STP with measurements, 6.25 inch length, 3.25 inch cup, handmade platinum silicone STP for trans men and non-binary people

Number One STP handcrafted platinum silicone stand to pee packer, trans masculine STP with soft powder finish and wider shaft opening

Number One STP - detail view for trans men and transmasculine people

Number One STP - view 4 for trans men and transmasculine people

Number One Laboratory STP in light and medium skin tones, handcrafted stand to pee device, formerly Form Function

Wonderful!

Definitely listen to the documentation and figure out what works best in an easy to clean environment before going out in public with it. It took me some tries, but eventually found the best orientation that works for me. Thinking of it more like it's catching (setting it lower and not pressing it against myself) rather than extending (pressing it snug to my body) helped me a lot.

Worked better than expected!

Number One STP

Thanks again!

This is my 2nd purchase! I would love if it was an inch longer to clear better... but love this.

Functional and sturdy

This is my first STP purchase. The bowl was a bit more narrow than I expected and I couldn't figure out a way to comfortably pack with it. I bought the slingshot harness, but didn't realize the harness wasn't compatible with this STP in particular. I successfully used it in the shower and at the toilet, but I was too scared to try using it while wearing clothes. If I wasn't careful with releasing my stream, the bowl would tend to overflow and leak from the back. It could be poor positioning on my part, but I haven't figured out how to position it in a way that wouldn't leak onto my underwear. Overall a good first STP, although I wish the price was a bit lower, can't complain too much compared to the price of other STPs out there.