I found a Kritzkrieg (ooohhhhhhhh) but didn't have any backpack slots open for it. No worries - an expander is 99 cents, I'll buy one... - 1 ITEMS BACKPACK EXPANDER REMOVE $0.99
Backpack Expander - Official TF2 Wiki | Official Team Fortress Wiki
Pro Executive Laptop Backpack 2023 | USA Made | WaterField Designs
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For its next trick, Movpak's electric skateboard backpack will consume all gadgets - The Verge
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Stash Pack Alien Expander – Vincita Co., Ltd.
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Command to use backpack expanders · Issue #216 · Nicklason/tf2-automatic · GitHub
MONO Expander Backpack | Reverb
Pacmo
TF2 - How to get and use the Backpack Expander - YouTube
Review: Civilian Expander Backpack by MONO | Inspirationfeed
Buy Elevation™ Plus Softside Backpack for USD 119.99 | Samsonite US