EB18: Sub 5g water bottle cage isn't even the lightest from Carbon Works - Bikerumor
Aluminium Lightweight Bicycle Water Bottle Cage
Is this the world's lightest bottle cage? | Mountain Bike Reviews Forum
LifeLine Lightweight Carbon Water Bottle Cage | Wiggle
Amazon.com: MARQUE Bike Water Bottle Holder - 18g Bicycle Bottle Cage for Road and Mountain Bike, Made from Lightweight and Durable Aluminum, Available in Black and Silver, Stainless Steel Bolts Included (Black) :
Amazon.com: N+1 Carbon Fiber Lightweight Bike Water Bottle Holder- Bicycle Bottle Cage with Integrated Tire Levers and Steel Bolts for MTB, Road Bikes, and Mountain Bikes : Sports & Outdoors