Ultimate Guide to Choosing the Best Trans Masc and Nonbinary Underwear
Best Trans Masc & Non-Binary Underwear: The Complete Guide
Packing, STP, flat-front, sporty, or stealth — how to choose underwear that actually fits your body, your gender, and your life.
Finding the right underwear is about so much more than style. It's about gender euphoria, comfort, and feeling at home in your own body. Whether you pack, use a stand-to-pee device, want a flat front, or just want silhouettes that match your vibe — this guide walks you through every option and links you directly to Cake Bandit styles that might become your new go-tos.
Cake Bandit is designed by and for trans men, trans masculine, non-binary, gender-non-conforming, and gender-expansive people. Every style here is built with function as much as aesthetics — supporting your bulge (or lack thereof), helping you feel secure in bathrooms, and moving with you through everything.
Why Specialized Underwear Matters
Traditional underwear rarely considers packing, STPs, or dysphoria. Gender-affirming underwear focuses on function as much as aesthetics — it supports your bulge (or lack thereof), helps you feel secure in bathrooms, and moves with you through work, school, workouts, and everything else.
The right underwear doesn't just hold a packer. It changes how you walk into a room.
Packing Underwear — Everyday Bulge & Support
Packing underwear includes an internal pocket or pouch that holds a packer snug against your body — no harness, no adjusting, no shifting. It's the most accessible everyday packing setup for most people.
Boxer Briefs — The Classic
Secure internal pouch, soft cotton-spandex, 6" inseam. Stays put under jeans, sweats, or anything else.
Same secure pouch in a shorter, lower-profile cut. Ideal for warmer weather, shorter shorts, or smaller frames.
Briefs — Low Bulk, Clean Silhouette
Curved front pouch, low-rise fit, comfortable with or without a packer. No added bulk in the leg of your pants.
Jock front, full back, no logo. Secure packing pouch built for sports, gym, dance, and all-day active wear.
All Cake Bandit underwear is low-rise and designed to sit on your hips, not your natural waist. If you're between sizes or prefer a more relaxed fit, size up. Hip measurement is the most important number — check the size chart on any product page.
STP Underwear — Stand to Pee Without a Harness
STP-compatible underwear keeps your stand-to-pee device in place, helps with angle and alignment, and gives you easier access at a urinal. No harness needed, no fishing around mid-pee.
3-layer front panel, internal sleeve, outer opening. Works with STP Freely, The Lou, and most soft STPs. Lays flat without a packer too.
Full STP functionality in a shorter cut. Three-layer construction, low-rise fit, less leg coverage.
STP functionality in a brief cut. Low bulk, low-rise, lays flat when not in use.
Pair STP underwear with the STP Freely ($48) or The Lou STP ($48) and read our complete STP guide before your first attempt.
Harnesses — Maximum Stability & Stealth
A harness holds your packer or STP tight to your body independently of your underwear — meaning you can wear any underwear you like over it, including loose boxers. Ideal if you pack heavy, move a lot, or want consistent placement no matter what.
No buckles, no Velcro, no extra straps. Soft elastic band with front straps. Packs up or down. Go-to for daily wear and play.
Neutral skin-tone colors for a discreet look under any underwear. Soft, strong elastic — completely invisible under fitted clothing.
Boxer brief harness with O-ring attachment. Works for packing and play — switch from daily packer to your favorite toy without changing setups.
Flat-Front & Jock Styles
Not everyone packs or uses an STP — and you still deserve hot, affirming underwear. Flat-front styles give you a smooth front without a pouch, while jockstraps prioritize breathability and movement.
Smooth flat front, classic jock back. Sexy, supported, and bold — without a pouch.
Contrast piping, athletic vibe, soft and wearable all day. Can also be worn with most packers.
Curved to work with your body — wear it with a packer or without. Airflow, movement, and a little cheek.
How to Choose What's Right for You
| What you want | Best option |
|---|---|
| Natural bulge, everyday packing | Packing boxer briefs or packing briefs |
| Stand to pee with no harness | STP boxer briefs or STP briefs |
| Maximum security, wear any underwear | Packing harness or skin tone harness |
| Flat front, no bulge | Flat front jock |
| Active wear, gym, sport | Sport briefs or sporty jock |
| Swimming or water use | Cake Bandit swim styles — never pack in regular underwear in water |
| Smaller frame or youth sizing | 3" inseam styles starting at XS — 3" boxer briefs or packing briefs |
Sizing Tips
- Measure your hips, not your waist. All Cake Bandit underwear is low-rise — it sits on your hips where your underwear naturally rests
- When in doubt, size up. Cake Bandit runs true to size but a slightly roomier fit is more comfortable and holds a packer better than a snug fit
- Inseam length matters. The 6" inseam adds coverage under shorts — the 3" cuts are better for warmer weather or shorter shorts. Note: longer inseams can make pants feel slightly tighter at the thigh
- XS–4XL available across most styles — check the size chart on individual product pages for exact hip measurements
FAQ
What's the best underwear for packing?
The best packing underwear has a secure internal pouch that keeps your packer in place without shifting. For most people, Cake Bandit 6" Packing Boxer Briefs or Packing Briefs are the go-to for everyday wear. They work with most soft packers including the Mr. Limpy, My Buddy 4", and the #1 Trans Packer.
What's the difference between packing underwear and a harness?
Packing underwear has a built-in pouch for convenient everyday use — no extra gear needed. A harness provides a more secure, stable hold independent of your underwear and is better for intense movement, specific positioning, or wearing looser boxers over it. Many people use both — harness for active days, packing underwear for everyday wear.
Can I use an STP with packing underwear?
Yes — but you need STP-specific underwear. Regular packing underwear pouches aren't designed to guide an STP shaft to the fly opening. Cake Bandit STP boxer briefs have a dedicated three-layer system that positions your device correctly and opens at the front for urinal use. They also lay flat and work as regular packing underwear when you're not using an STP.
What underwear works best for trans masc people who don't pack?
Flat-front jocks and flat-front boxers give you a smooth, affirming front profile without a pouch. The Cake Bandit Flat Front Jock and Sporty Jock are built for this — sexy and supportive without any packing function you don't need.
Is there underwear for youth or petite trans masc people?
Most Cake Bandit styles start at XS, which fits smaller bodies and younger people exploring packing. The 3" inseam styles work best for smaller frames. For youth packing, the Lil Buddy 3" Mini Packer pairs well with XS brief or boxer brief styles.
Can packing underwear help with dysphoria?
Many trans men, trans masc, and non-binary people report that packing significantly reduces body dysphoria and increases confidence. The right underwear — built by and for this community — often enhances that feeling. It's not a universal experience, but it's a common one and worth exploring.
Will packing underwear work with any packer?
Most soft silicone and TPR packers fit. Cake Bandit's pouches work with the Mr. Limpy, My Buddy 4" and 5", the #1 Trans Packer, and most standard soft packers. If you're unsure, choose a style with a slightly deeper pouch for maximum flexibility.
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