A light and rigid can cage for your bicycle is made out of leather with a snug fit. The rigid leather is hand-stitched together to be structurally sound and designed to fit a standard can size but also fits tallboys.
It comes ready to install with three clamps to connect the cage to your bicycle or penny farthing: two on the handlebar and one around the stem spacers. Each item is made to order in a workshop in Portland, Oregon priced at $65 at Etsy.
I built one out of plumbing pipe and metal clamps for less than $5.