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Packing 202: Underwear, Swimming, Sports, Periods, and STPs

Charles Wallace is a PhD student studying insect systematics, as well as a writer, podcaster (@ASABpod), macro photographer, and amateur aerialist. He lives in the metro Phoenix area with his two cats.

This is Part II in a two-part series on packing. Part I covered what is packing, types of packers, how to choose a packer, and how to care for them.

Once you’ve got a packer, you need something to hold it secure. The easiest and cheapest option is to wear a snug-fitting pair of briefs or trunks and place a lightweight packer into the fly. This option is most effective when you aren’t moving around much, or where there’s an additional snug layer to keep things in place (e.g. if you were to wear leggings).

Beyond that, there are three primary options: a harness, a detachable pouch, and underwear with a built-in pocket.

Choosing Between the Three

A harness offers minimal coverage and is the best option if you want to wear looser underwear or no underwear at all. Harnesses work with realistic packers, and can offer a very secure placement (good for sports or swimming). The biggest variety is available from TranZwear.

New York Toy Collective Packer Pouch with Magnetic Closure

A detachable pouch relies on the thick, sturdy elastic waistband typical of most men’s underwear. Shaped like a pillowcase (rectangular, with an open end), you place a packer within the pouch, and secure it to your waistband. Most options use large safety pins, but the New York Toy Collective sells one which closes with strong magnets.

The previous two options are best if you want to stick with your own underwear, but there are a variety of pairs which are made specifically to hold a packer. Packing underwear typically has a pocket in the front, which, unlike a fly, has a single horizontal opening at the top. These are meant to fit snugly, and thereby hold the packer in place. Different options (in a variety of cuts) are available from many of the retailers at the bottom of this article.

Cake Bandit plus size packing harness/jockstrap

Cake Bandit from TransGuySupply

A note on sizing: Popular options Jockmail and RodeoH both notoriously run small. For larger sizes, “Cake Bandit” from TransGuySupply and the “Pete” line from SpareParts go up to a 50” waist. 

Special Considerations


Anecdotally, a lot of trans people avoid swimming because it can feel like a dicey proposition. Bathing suits are typically skintight, and even more so after getting wet. Whereas it’s not unusual for the front of your pants to be flattish, that’s less the case with swimsuits – increasingly less so as they get smaller and tighter.

Rainbow Rears Accentuating Swim Bottoms which allow packing while swimming

Rainbow Rears Accentuating Swim Bottoms

Packing while swimming may help restore some confidence, if not relieve dysphoria. Even more than with everyday wear, packing for swimming requires a packer which won’t absorb water (e.g. a silicone option vs. a foam insert), and something to hold it in place despite rigorous movement. The best option for most men’s swimwear is likely a secure harness worn beneath trunks or board shorts. 


In addition to previous tips on keeping a packer in place, there are several options for jock straps modified to hold a realistic packer. Several seem more fashionable than functional (e.g. TG Supply’s “Cake Bandit” jocks), but rodeoH offers a black sport jock with construction to hold a packer securely.


As mentioned in Part I, an STP (“stand-to-pee”) is a device which allows people without a penis to pee standing up with some control. Increasingly, these are made for and marketed towards people looking to have a realistic penis. Some of the earlier options, e.g. the “Go Girl,” are abstract and obviously marketed to cis women.

Using a packing/stand to pee device in conjuction with a harness

Instructions for how to use New York Toy Collective's STP Strap

The major difference between STPs and other realistic packers is that an STP needs to sit flush against the genitals, so they can’t be worn within a pocket. STPs more than other realistic packers may benefit from wearing with a harness underneath full-coverage underwear, with a fly.

  • NYTC sells a strap compatible with their packers, including their STP “Sam”.
  • TRUHK briefs and boxer briefs are full-coverage underwear made specifically to be STP-compatible, and are available from RodeoH in several colors.
  • Transthetics sells an STP and both briefs and boxers designed to be compatible with it.


Spectrum Outfitters 3-in-1 Boxers

Depending on the products used, menstruation may or may not conflict with packing. Underwear designed for men typically don’t accommodate liners or pads very well, but UK company Spectrum Outfitters offers “3 in 1” boxers with a built-in brief and a discrete packer pocket.

Where to Buy Packing Underwear

All of these stores offer domestic (USA) and at least partial international shipping. One, Spectrum Outfitters, is UK-based, and offers shipping internationally. Most are also trans owned and run.

  • FtM Essentials is a secondary retailer of various soft packers, STPs, harnesses (including the Aslan brand packing straps), and full-coverage packing underwear from rodeoH, Spare Parts, and Cal Exotics.
  • New York Toy Collective is a primary retailer of several well-loved soft packers, packing pouches with a magnetic closure, and STPs, as well as an array of sex toys. They offer some products with slight defects at a minor discount on their own website. Their products are often available through secondary retailers such as FtM Essentials.
  • RainbowRears is an Etsy store in which a variety of gender-affirming underwear options are offered, including a jock made to hold an STP; briefs which optionally have extra room, a pocket, or sewn-in polyfill packer; and swim trunks with a packer pocket sewn in. Only accepts orders on Friday, Saturday, and Sunday.
  • RodeoH is primarily known for their strapless strap-on harness underwear, but they also offer a variety of soft packers, STPs, and full-coverage packing underwear. rodeoH underwear run notoriously small and tend to have a very low rise. They accept returns for store credit only. 
  • Spectrum Outfitters is a UK-based company (which does ship internationally). They offer a foam packer and 3-in-1 boxers equipped to hold both a packer and a sanitary pad.
  • Trans Guy Supply is a retailer of numerous soft packers and several forms of packing underwear, including their Cake Bandit label and several variations on Jockmail pocket underwear.
  • Transthetics primarily offers prostheses for both sexual and non-sexual use. They carry an STP and two types of packing underwear in both briefs and boxer brief designs.
  • TranZwear is a unique supplier. They do not sew or design their own underwear, but modify pairs from various brands with rings, pouches, or other options to hold a variety of packers in place. They also sell, among many items, soft packers, STPs, swim trunks, and harnesses.

Many packers and packing underwear can also be found at sex toy shops, in their “gender expression”/ “gender gear” sections (nsfw).

Ultimately, whether and how you pack depends on a lot of factors, and there are now more options than ever to serve them. Hopefully, these two articles have given you a strong foundation in what’s available, and there is an ever increasingly robust community of people online (such as r/ftm) who can give you even more personal testimonies, tips, and in-depth reviews. 

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Cora Harrington

Founder and Editor in Chief of The Lingerie Addict. Author of In Intimate Detail: How to Choose, Wear, and Love Lingerie. I believe lingerie is fashion too, and that everyone who wants it deserves gorgeous lingerie.