These packer underwear are made especially to wear with your StP device. Check out the inner workings, Take the guesswork out of matching your STP
Rodeoh STP TRUHK Boxer - Ultimate Packer Underwear
RODEOH Truhk Pouch Front Packing STP Boxer Underwear - FTM Transgender (L) Black at Men's Clothing store
Coconuts Stand-to-Pee & Packer Jock Harness
RODEOH UNDERWEAR REVIEW
FTM Trans Boxer STP/Packing Underwear
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Men's Boxer Briefs - RODEOH / Men's Boxer Briefs / Men's Underwear: Clothing, Shoes & Jewelry
RODEOH Truhk Pouch Front Packing STP Boxer Underwear - FTM Transgender (L) Black at Men's Clothing store
Packing Straps & Underwear
RODEOH Truhk Pouch Front Packing STP Boxer Underwear - FTM Transgender (L) Black at Men's Clothing store
Pouch Front Boxer STP/Packing Underwear Truhk
RodeoH Truhk Classic Brief Underwear Black Size M
DIY O-ring in packing underwear : r/asktransgender
RODEOH Truhk Pouch Front Packing STP Boxer Underwear - FTM Transgender (L) Black at Men's Clothing store