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34

4-in-1 STP Medical-Grade Silicone Packer – A Complete Guide to Choosing Your Prosthesis

Choosing a 4-in-1 packer isn't just about choosing a penile prosthesis.

It’s about choosing a size that makes you feel confident.
A style that suits you.
A tool for self-expression that’s with you every day and in your most intimate moments.

Discreet under clothing.
Allows for standing urination.
Erectile function for penetration.
Realistic feel thanks to premium medical-grade silicone.

At Be Who You Are, we offer a selection of realisticpackers designed for trans men and transmasculine individuals, combining safety, comfort, and performance.

Here’s the complete guide to choosing the right model for your body type, your needs, and your lifestyle.

What is a 4-in-1 STP packer STP

A 4-in-1 packer is a medical-grade silicone penile prosthesis that combines:

  • Natural volume under clothing
  • STP function STP standing urination)
  • Erectile function for penetration
  • Built-in internal stimulation

This is the most comprehensive solution for those looking for a transgender and versatile transgender prosthesis.

How do you choose a 4-in-1 packer?

1️⃣ The desired level of discretion

The longer and thicker it is, the more noticeable it will be under clothing.

  • Allday 10 cm → Lightweight and discreet, ideal for extended daily wear
  • Mr Flex 12 cm → A natural balance between discretion and presence
  • Trex 13 cm → Thick and textured, with a bold look
  • Princesex 15 cm → Large, better suited for intimate use than for discreet packing

2️⃣ Weight and comfort

Weight directly affects how you feel on a daily basis.

  • 160 g → very light
  • 190 g → comfortable
  • 240 g → no longer available
  • 330 g → requires extra support

If you're just starting out, go for a lightweight model.

3️⃣ Your main use

🔹 For daily use

To wear your packer all day long:

  • Choose a lightweight model
  • Wear a daily harness or appropriate packing boxers
  • Use packing powder

👉 Setting powder (click here) is essential:
It mattifies the silicone, reduces shine, minimizes stickiness, and improves comfort against the skin.
It also extends the life of your prosthesis.

🔹 Intimacy-focused use (play)

For penetration:

  • Opt for a reinforced harness
  • Choose the right vertebra (blue or NewZ)
  • Provides stable support

A reinforced harness (click here) is essential for maximum stability while playing.

Essential accessories to get the most out of your packer

🧴 Packing powder (essential)

  • Matte finish for silicone
  • Reduces shine
  • Eliminates stickiness and reduces friction
  • Makes the texture look more natural
  • Improves everyday comfort

Without powder, the silicone may remain slightly shiny and tacky.

📦 Storage box or pouch

Medical-grade silicone must be stored properly.

A storage box allows you to:

  • To stay in shape
  • To avoid dust
  • To preserve traditional painting
  • To carry your packer discreetly

Never store in a sealed plastic container or in a damp environment.

🩳Boxers designed for packing

Packing boxers allow you to:

  • Stable support
  • Convenient use of the STP feature
  • Stability throughout the day
  • Full use of the packer's features

It's the most versatile solution for everyday use.

🔗 Jockstrap vs. reinforced harness

Daily harness

Ideal for:

  • Everyday use
  • Discreet support
  • Long-lasting comfort

Reinforced harness

Ideal for:

  • Erectile use
  • Play
  • Maximum stability

Why choose a premium medical-grade silicone packer?

Medical-grade silicone offers:

  • Realistic, skin-like texture
  • Resistance to urinary acidity
  • Natural flexibility
  • Personal safety
  • Superior durability

That’s the difference between a high-end, lifelike prosthesis and a standard product.

Quick comparison of models

Model Volume Weight Ideal use Profile
All Day Discreet Lightweight Daily Beginner
Mr. Flex Natural Balanced Mixed Versatile
Trex Tagged Present Sensations Intermediate
Princesex Imposing Heavy Privacy Advanced

How can you extend the life of your packer?

  1. Clean with warm water and mild soap
  2. Completely dry inside and out
  3. Application of packing powder
  4. Storage in a suitable container
  5. Never store it with the spine inserted

In conclusion

Choose the model that suits your comfort level:

Discretion → Allday
Balance → Mr Flex
Texture → Trex
Maximum presence → Princesex

And enhance your experience with:

  • Mattifying powder
  • Boxer shorts
  • Standard or reinforced harness
  • Storage pouch