The Vive box dimensions are 52cm x 19cm x 32cm (as of July 2015). This is smaller than what people find if they search google. Now small enough for airline carry-on! :
HTC VIVE Cosmos Elite Review - Gaming Nexus
VIVE Link Box (2.0)
VIVE Link Box | For VIVE Pro Series VR Headsets | Knoxlabs
🔥 HTC Vive Virtual Reality Headset - FULL KIT with box 🔥 🚀SHIPS WORLDWIDE🚀 | eBay
Amazon.com: HTC America VIVE Link Box (2.0) : Video Games
You might need a manual just to unpack the HTC Vive - The Verge
HTC Vive Review - WhatVR
HTC Vive VR Headset System Virtual Reality Complete Set w/Box Japan Used | eBay
Default-on Link Box for VIVE Pro | VIVE United States