Compact Sport STP 4": Low-Bulk Stand-to-Pee Packer by Number One Laboratory
$55.00 $74.00Discreet 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
Less bulk for tighter pants.
Number One Laboratory's low-bulk take on their Model D, with smaller balls and a shorter cup. Bulge 3/5.
Same shaft and head as the Model D. It's handmade from platinum silicone with a soft powder finish that cuts chafing and the tacky feel. Compare sizes in the bulge rating guide.
- Shaft length: 4" (10.1 cm)
- Width: 1.25" (3.2 cm)
- Height, base of balls to top of shaft: 3.5" (8.9 cm)
- Material: 100% body-safe platinum silicone with a matte powder finish
- Boilable and top-rack dishwasher safe
It's made for tighter pants, active days, and smaller frames, and each one is finished and checked by hand. The bulge is smaller than the standard Number One STP because of the smaller balls.
The tradeoff: the shorter cup needs more precise placement, and you'll want to ease up on your stream more than with a standard STP. It takes a little longer to learn, so it's best once you've used an STP before.
It needs to sit firmly against your body, so wear it in a snug harness or fitted STP underwear. Loose clothes shift it and make leaks more likely.
Number One's Model E is smaller overall, with a 3" shaft.
Give yourself extra practice sessions before you use it out.
- In the shower with the water off and no clothes. Get a flush, centered seal before you start.
- Over the toilet with no clothes, with a moderate stream. It works best when you're not at full pressure.
- In the Slingshot Harness or snug Cake Bandit STP underwear, which keep it in the same spot.
- Fully dressed. Once you go clean every time at home, you're ready.
More in our STP guide.
- Wash with hot water and soap after each use, or use our packer & toy cleaner.
- To sterilize, boil it for 3–5 minutes or run it on the top rack of the dishwasher with no detergent.
- Let it air dry completely, then store it somewhere cool and dry, out of the sun.
- Use water-based lube only. Silicone lube breaks down platinum silicone over time.
- Dust with Packer Renewing Powder every day after washing, and before storing it.
- Totally new to STPs? Try the STP Freely or Packer Gear STP, which are more forgiving.
- Want more bulge? Try the standard Number One STP.
- Harnesses: including Number One's Slingshot Harness, for a snug hold.
- Cake Bandit harness: keeps it firmly against your body.
- STP briefs or STP boxer briefs: fitted STP underwear.
- STP jock: another fitted option.
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.
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