Updated 14 August 2024: Added a wider version of the small loop, and a new larger loop.
The original was made for the smaller size of butane type fuel canisters used by Jetboil, MSR, et al. Advertised can capacities are ~100g and ~230g depending on the fuel blend and brand. The loops are sized to 86mm ID and 105mm ID respectively. This gives a snug fit without being difficult to put on the cans I have on hand right now (Gas One, JetBoil, and GSI brands).
Given that a can with fuel in it should have some weight still, and the loop is meant to fit right against the bottom lip … it should hang down and away from the loop. If you want a tighter fit I would downsize very slightly or let me know if you have a specific dimensioning request!
The author marked this model as their own original creation.