13 Essential STP Stand-to Pee Packer Tips
How to Use an STP Packer: The Complete FTM Guide
13 tips for standing to pee successfully — from finding your urethra to using a urinal in public for the first time.
The first time I tried to pee standing up, I was trekking in the Tanzanian bush. Right before my trip, the local government in Dar ramped up their anti-LGBT activities — people were being jailed for befriending queer people on social media. I knew I'd be in situations where bathroom privacy wasn't guaranteed. I bought a hard plastic stand-to-pee device from a camping store and packed it in my carry-on.
Miraculously, it worked on the first try. I used it several times across two weeks with no issue. When I got home, I packed it away and forgot about it.
Fast forward a few years: I discovered FTM STP packers. I bought a Number One STP and was genuinely shocked when success didn't come as easily. I went through several models — and several dollars — before finding one that worked for my body. And even then, it took real practice to get reliable results.
Using an STP packer can be a challenge. A handful of people nail it immediately. Most need practice, and it's not uncommon to get frustrated after weeks of failed attempts. Once it finally clicked for me though, the ability to stand to pee was a revelation — even if sitting doesn't trigger your dysphoria, standing up changes something. Plus it's genuinely useful when you're camping, hiking, or anywhere bathroom privacy is limited.
This guide is every useful tip I found — from anatomy basics to pee shyness. May you one day write your name in the snow.
What Is an STP Packer?
An STP (stand-to-pee) packer is a prosthetic worn in the underwear that lets you urinate standing up. It combines a funnel or bowl that sits against your body with a shaft that directs urine forward and downward — like a urinal would. Most STP packers also function as everyday packers, creating a natural-looking bulge under clothing. Some are 3-in-1 devices that also work for intimate play.
STP packers are used by trans men, trans masculine, non-binary, and gender expansive people who want to use urinals or standing-only restroom situations without sitting down.
How Does an STP Packer Work?
Think of an STP packer as a funnel system. The bowl or cup portion sits against your body, aligned with your urethra. When you urinate, the liquid flows into the bowl and out through the shaft — which you angle downward into the toilet or urinal.
The mechanics are simple. The challenge is in the positioning — specifically, getting the bowl aligned precisely with your urethra every time. Too far forward and you miss the device entirely. Too much flow and the bowl can't drain fast enough, causing backflow. This is why practice matters and why the tips below exist.
Which STP Packer Should I Buy?
The best STP for you depends on your pee stream strength, how you want to use it (pack only, urinal use, or both), and your comfort level with positioning. Here are the main options:
The Lou STP
Wide funnel opening makes positioning more forgiving. One of the most beginner-friendly STP packers available — handles heavier pee streams better than most.
Shop The Lou →STP Freely XL
Large bowl designed for strong streams. Pairs with an insertion rod ($20) to become a full 3-in-1 device at $72 — most comparable options start at $200+.
Shop STP Freely XL →pStyle
Consistently rated among the easiest STPs to use. Hard plastic, simple design, low price. Great starting point — once you succeed with the pStyle, prosthetic STPs become much easier.
Shop pStyle →Emisil Compact STP
Highly realistic silicone prosthetic STP. Smaller bowl — best for moderate pee streams. Premium look and feel for daily packing and occasional STP use.
Shop Emisil →Some STPs have a pee hole that stays closed at rest and must be squeezed open. This looks more realistic — but using one requires three things simultaneously: positioning the bowl, aiming the shaft, and squeezing the tip open. That's a lot to manage. Unless someone's head is literally at crotch level and facing you, nobody in a public bathroom is inspecting the width of your pee stream. Choose function over appearance, especially when you're starting out.
13 Tips for Using an STP Packer Successfully
Locate your urethra
Your urethra is approximately one inch behind your clitoris — further back than most people expect. This is the single biggest reason people fail with STPs initially: positioning the device too far forward. The bowl of your STP needs to align with your urethra, not with your clitoris. Once you know where it actually is, your success rate improves dramatically.
Practice in the shower first
Start with the shower off so you can identify any spills clearly. The shower is the ideal practice environment — cleanup is easy, there's no pressure, and you can focus entirely on positioning. Don't skip this step and go straight to a public urinal. Trust the process.
Graduate slowly
Once you've had five consecutive spill-free showers, move to your home toilet. Start completely undressed — yes, really. Once you've nailed it naked, try with underwear only. Then fully clothed. Each stage builds the muscle memory you need before taking it public. Skipping stages is how accidents happen in public bathrooms.
Build the right muscles with Kegel exercises
If you have a strong or fast pee stream, the STP funnel may not drain fast enough — causing backflow and spills. Kegel exercises strengthen your pelvic floor and give you the ability to start and stop your stream on demand. To find the muscles: next time you urinate, try to stop the flow midstream — the muscles that clench are the ones you want to strengthen. Contract for 5–10 seconds, relax, repeat 10–20 times daily. Over time, stopping your flow mid-STP use becomes a reliable tool for managing backflow.
Buy the right STP for your stream
If you consistently have backflow issues, the problem may not be technique — it may be that your STP's bowl is too small for your pee stream. The STP Freely XL and The Lou both have larger bowls designed for heavier flows. Starting and stopping your stream repeatedly isn't great for your urinary health long-term — if you're doing it on every use, try a wider device.
Modify your STP if needed
If you love a particular STP but the shaft hole is too small for your stream, you can widen it yourself with a hobby knife (available at any hardware store). Work slowly and carefully — small adjustments make a real difference. The aesthetic hit is minimal — as established, nobody is examining the width of your pee stream in a public restroom.
Use underwear with a fly hole
A fly hole conceals any harness you're wearing and can help stabilize your STP. An additional tip from Transthetics: cut a small hole in the inner layer of fly-hole underwear where the shaft sits, and pull the shaft through that inner layer first. This extra anchor point significantly improves stability during use. That said — most cis guys actually pull the waistband down rather than using the fly. It's faster. Both methods work.
Or use purpose-built STP underwear
Cake Bandit's STP Boxer Briefs are designed to work seamlessly with the STP Freely and Freely XL — the pouch positioning makes alignment more reliable and consistent than a standard harness setup. If you're using the Freely system, this underwear is worth the upgrade.
Wear looser pants
Tight jeans can prevent your zipper from going down far enough to position your STP correctly. If you're a tight-pants person and don't want to change your style, the workaround is to unbutton and pull down slightly — just be mindful of how far down. Alternatively, looser fits make the whole process significantly easier and faster.
Go before you really need to go
A full bladder means a stronger, harder-to-control pee stream — exactly what causes backflow. If you go as soon as you feel the first urge, your stream is more moderate and manageable. Don't wait until you're desperate. Your bladder and your dignity will thank you.
Visualize for success
Before going public for the first time, have a plan. Are you using a stall or a urinal? What will you do with your STP after — put it in your pocket, or are you packing with it? Knowing what you're going to do before you're standing at a urinal removes a layer of real-time decision-making and reduces anxiety. Anxiety is the enemy of a smooth STP experience.
Be patient with yourself
Every body is different. What works for one person may not work for another, and what fails with one STP model may succeed with another. If your prosthetic STP is consistently failing, try the pStyle — it's hard plastic, inexpensive, and consistently rated the easiest STP to use. Succeed with the pStyle and then go back to your prosthetic. For many people, that practice translates directly and things that didn't work before suddenly click.
Overcome pee shyness
If you've been sitting to pee your entire life, your brain may need convincing that standing is okay. Add in the anxiety of a public restroom and your urinary sphincter can lock up entirely — technically called paruresis, or shy bladder. If this is you: close your eyes and picture yourself sitting down. Avoid negative self-talk. Some people find it helps to literally pump themselves up — tell yourself you're doing great until you actually feel it. If pee shyness is persistent and severe, cognitive therapy is well-documented as the most effective treatment.
Once it finally clicked, the ability to stand to pee felt like a revelation. Even if sitting doesn't bother you, standing changes something.
FAQ
What is an STP packer and how does it work?
An STP (stand-to-pee) packer is a prosthetic worn in the underwear that lets you urinate standing up. It has a bowl or cup that sits against your urethra and a shaft that directs urine forward and downward into a toilet or urinal. Most STP packers also function as everyday packers, creating a bulge under clothing. The key to using one successfully is precise alignment — the bowl must sit over your urethra, not your clitoris, which is further back than most people initially expect.
How do I use an STP packer for the first time?
Start in the shower with the water off. Locate your urethra (roughly one inch behind your clitoris), position the STP bowl over it, and practice until you have five consecutive clean uses. Then move to your home toilet — starting undressed, then underwear only, then fully clothed. Only after you're reliably successful fully clothed at home should you try a public restroom. The graduation process feels slow but it's what separates people who succeed from people who have expensive accidents.
Which is the best STP packer for beginners?
The pStyle is the most consistently recommended STP for beginners — simple hard plastic design, wide opening, forgiving to use, and inexpensive. For a prosthetic STP, The Lou has the most beginner-friendly bowl design. If you have a heavy pee stream, the STP Freely XL handles higher flows better than most.
Why does my STP packer leak or overflow?
The two most common causes are positioning and flow rate. If the bowl isn't aligned with your urethra (it's further back than most people think), urine misses the device entirely. If your pee stream is stronger than the bowl can drain, it backflows out the sides. Solutions: practice the positioning until it's automatic, do Kegel exercises to learn to modulate your stream, go to the bathroom before you're desperate, and consider a wider-bowl STP like the Freely XL or The Lou if overflow is consistent.
Can I make a DIY STP packer?
Hard plastic STP devices like the pStyle are simple enough in design that some people make DIY versions from plastic funnels or bottles. However, off-the-shelf options start at under $20 and are purpose-designed for body contact and urine flow — a DIY version is rarely worth the effort or mess. If budget is the barrier, the pStyle is the most affordable entry point we carry.
What underwear works best with an STP packer?
Purpose-built STP underwear like Cake Bandit's STP Boxer Briefs are designed specifically for STP use — the pouch positioning makes alignment more reliable than a standard harness. If you're using the STP Freely system, these are the recommended pairing. Alternatively, underwear with a fly hole gives you more positional control and conceals any harness you're wearing.
The STP journey has a real learning curve — that's just the reality. But the frustrating weeks of practice are temporary and the payoff is lasting. Every person who's figured it out started where you are now.
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