Ultimate Guide to Choosing the Best Trans Masc and Nonbinary Underwear
Ultimate Guide to Choosing the Best Trans Masc and Nonbinary Underwear
Packing, STP, flat-front, sporty, or stealth, here’s 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 (STP) device, want a flat front, or just want silhouettes that match your vibe, this guide walks you through the main options and links you to specific Cake Bandit styles that might be your new go-tos.
Why Specialized Underwear Matters
Traditional underwear rarely considers packing, STPs, or dysphoria. In contrast, 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.
That’s why Cake Bandit focuses on fit, fabric, and function, so your underwear works for your body.
Packing Underwear: Everyday Bulge & Support
Packing underwear includes an internal pocket or pouch that holds a packer snug against your body. Because of that, it’s perfect if you want a natural-looking bulge that stays put without constant adjusting.
Cake Bandit 6" Packing Boxer Briefs
For folks who like a bit more coverage and a classic boxer feel, the Cake Bandit 6" Boxer Briefs offer a secure internal pouch, soft cotton-spandex fabric, and a 6" inseam that stays put. They’re great for everyday wear, working from home, or packing under jeans and sweats.
Cake Bandit Monochrome 6" Boxer Briefs & Cake Bandit Striped 6" Boxer Briefs
Cake Bandit 3"Packing Boxer Briefs
If you prefer a shorter leg or you have a smaller frame, the Cake Bandit 3" Packing Boxer Briefs give you the same secure pouch in a more compact, low-bulk cut. These are ideal for warmer weather, shorter shorts, or folks who want less fabric on the thigh.
Cake Bandit 3" Black Boxer Briefs & Red Swim / Athletic Boxer Briefs
For a more traditional brief style, you can also try the Cake Bandit Packing Briefs, which offer a curved front pouch and low-rise fit that’s comfortable with or without a packer. This style offers less bulk in your pants. Underwear can add up to 1/2" extra in the leg of your pants making them tighter. No worries with briefs as the leg opening doesn't go low enough to add any additional bulk.
Heather Grey Cake Bandit Packing Briefs
Sport Briefs for Secure, Low-Rise Packing & Everyday Movement
In addition to boxer briefs and jockstraps, sport briefs are becoming a favorite among trans men, trans masc, nonbinary, and gender-expansive folks who want a sleek, athletic fit with reliable packing support. Because they sit lower on the hips and offer a curved front, sport briefs provide a flattering silhouette while keeping everything firmly in place.
The Cake Bandit Sport Briefs blend sporty energy with all-day comfort. With a built-in interior packing pouch, they securely hold packers like the #1 Trans Packer, the #1 Trans Packer Uncut, and the My Buddy Packers.
Moreover, the clean, no-logo waistband and low-rise curve make these the perfect option for folks who want packing underwear that feels:
- Subtle under slim pants and shorts
- Secure during sports, dance, lifting, or movement-heavy days
- Comfortable for all-day wear, even in warmer climates
- Affirming without adding bulk
Additionally, Cake Bandit Sport Briefs come in multiple colorways, allowing you to match your vibe, your packer, and your wardrobe effortlessly.
So, if you want underwear that brings together style, stability, and gender euphoria, sport briefs are a must-try. You can explore all available colors and sizes here:
→ Shop Cake Bandit Sport Briefs
White and Black Cake Bandit Sport Briefs
STP Underwear: Stand-to-Pee Without a Harness
If you use an STP device, STP-compatible underwear can change everything. It keeps your device in place, helps with angle and alignment, and gives you easier access in public restrooms. As a result, you can stand to pee with more confidence and less stress.
- Cake Bandit Monochrome STP 6" Boxer Briefs – These STP boxer briefs feature a flat three-layer front panel, an internal sleeve to guide the shaft, and an outer opening for bathroom use. They work beautifully with STP Freely, STP Freely Uncut, the Lou STP, and many other soft STPs. Additonally they lay flat for when you do not want to pack and they are great with most packers too. So they are kind of a 3 in 1 style. Great for any day, all day wear, packing, not packing or for STP use.
- Cake Bandit STP 3" Boxer Briefs – If you want the same STP functionality in a shorter, lower-profile cut, the STP 3" Boxer Briefs offer three-layer construction and low-rise fit with less leg coverage. Additionally they too, lay flat without a packer or STP.
Olive Cake Bandit STP 3" Boxer Briefs
Harnesses: Maximum Stability & Stealth
Harnesses are great if you pack heavy, move a lot, or prefer a super consistent placement. Instead of relying only on underwear, a harness holds your packer or STP tight to your body, then you can wear whatever underwear you like over it, including loose boxers.
- Cake Bandit Monochrome Skin Tone Harness – The Monochrome Skin Tone Harness comes in neutral tones for a discreet look under underwear. It has no buckles, no Velcro, and no extra straps, just a soft, strong elastic band with front straps to pack up or down.
- Cake Bandit Harness (Old English Logo) – For a bolder vibe, try the original Cake Bandit Harness with the Old English logo. It’s a community favorite for everyday packing, especially with the #1 Trans Packer and My Buddy line.
- Pro Tip: Many users prefer this harness as their go-to harness for partnered play. Major gender euphoria when you don't need to change your daily harnesss for pleasure time. Simply change the packer to your favorite toy and boom. It's go time.
Cake Bandit Monochrome Skin Tone Harness and Olive Monochrome Harness
Flat-Front & Jock Styles: For Comfort, Breathability & Vibes
Not everyone wants a bulge or uses a packer, and you still deserve hot, affirming underwear. Flat-front jocks and flat front boxers with the comfort and quality you that let you breathe (literally and emotionally) while still serving lewks.
- Cake Bandit Flat Front Jock – The Flat Front Jock is perfect if you don’t pack but still want to feel sexy, supported, and bold. It has a smooth front and classic jock straps in the back.
- Cake Bandit Sporty Jock – For a more athletic look, the Sporty Jock adds contrast piping and a sporty vibe while still feeling soft and wearable.
- Cake Bandit Jocks - our regular jocks are made to curve with your body so you can wear them with a packer without one.
Youth & Petite-Friendly Sizing (XS & Small)
If you’re youth, shorter, or simply have a smaller frame, XS and Small sizes provide a better fit without bunching or sagging. Many Cake Bandit styles start at XS. To make sizing easier, we recommend checking the size chart on any Cake Bandit product page, such as the Cake Bandit Briefs, which includes hip measurements starting at smaller ranges.
How to Choose What’s Right for You
As you decide, it can help to start with a few questions:
- Do you want a visible bulge? Choose packing briefs or boxer briefs.
- Do you want to stand to pee? Go for STP underwear or use a harness with your STP.
- Do you want a flat front? Try flat-front jocks or non-packing briefs.
- Do you need extra security? Add a harness under your favorite underwear.
- Are you youth-sized or petite? Look for XS and 3" inseam styles.
More Resources from Transguy Supply
For deeper dives into packing, STPs, and gear care, check out:
- How to Pack: 11 Essential Tips
- Shop the Full Cake Bandit Collection
- Packer & STP Cleaning & Care Guide
Start with one or two pairs that match your daily life, maybe a packing brief, an STP boxer, or a flat-front jock. Then, as you learn what feels best, you can mix styles to support every version of you: at home, at the gym, at school, at work, or on the beach.
Ultimately, the best ftm, trans masc, nonbinday, gender expansive, underwear is the gear that makes you feel grounded, affirmed, and completely yourself. You deserve that, every single day.
FAQ: Choosing Trans / Masc / Nonbinary Underwear
What underwear is best for packing?
The best underwear for packing offers a secure internal pouch that keeps your packer in place without shifting. At Transguy Supply, our Cake Bandit Packing Briefs, Boxer Briefs, and Jockstraps are specifically designed for trans men, trans masculine, non-binary, and gender-expansive people. They work with most soft packers, including the TGS #1 Trans Packer and My Buddy.
What underwear should I use for an STP device?
You’ll want STP-specific underwear with a guided 3-layer system that positions the device correctly. Our Cake Bandit STP Boxer Briefs include a pocket, guide panel, and front access opening to support leak-free, no-harness use with STP Freely or similar models.
What’s the difference between packing underwear and a packing harness?
Packing underwear includes a built-in pouch for everyday comfort, while a harness provides a more secure hold for intense movement or specific positioning. For maximum security, try the Cake Bandit Packing Harness. For daily wear, packing briefs or boxers are usually more convenient and comfortable.
Do you offer underwear for youth or smaller bodies?
Many Cake Bandit items start at size XS, which fits smaller bodies and teens who need packing or flat-front options. The Lil Buddy 3" Youth Packer is especially helpful for young folks exploring packing in a safe, age-appropriate way.
How do I choose the right size for packing underwear?
Measure your hips where your underwear naturally sits — not your waist. Cake Bandit uses standard US sizing and runs low-rise. You can view the full size chart here: Cake Bandit Size Chart.
Will packing underwear work with any packer?
Most soft silicone packers will work! Our underwear is designed to fit the #1 Trans Packer, #1 Trans Packer Uncut, My Buddy 4", and My Buddy 5". If you’re unsure, choose underwear with a slightly deeper pouch for maximum flexibility.
Can I swim or work out in packing underwear?
Yes — but use gear designed for movement. The Cake Bandit Swim & Sport Jock dries quickly and holds your packer securely during swimming or workouts. Regular cotton underwear will not perform the same way in water.
What is the best underwear for a natural-looking bulge?
Look for briefs or boxer briefs with a curved pouch that sits flat and distributes weight naturally. Pairing Cake Bandit underwear with the #1 Trans Packer or Performance Packer creates a subtle, realistic bulge.
Do I need a harness for packing?
Not always! Many people prefer the simplicity of pouch underwear. However, for extra security or play, a harness can help. For minimalist everyday use, try the Cake Bandit Packing Harness. It’s discreet, comfortable, and works under any underwear.
Can packing underwear help dysphoria?
While everyone’s experience is unique, many trans men, trans masc, and nonbinary folks report that packing helps them feel more at home in their bodies and aligned with their gender expression. Choosing underwear built by us, for us often enhances that sense of comfort and affirmation.
What are the easiest packing options for beginners?
Start with a soft silicone packer like the Lil Buddy 3" or the #1 Trans Packer 4", paired with Cake Bandit Packing Briefs or Boxer Briefs. These options are comfortable, affordable, and require zero harness setup.
