G'day Dave,

At the moment it only fits on the right-hand side, if you try to put it on the left side it sits at an angle that would spill your drink. 

G'day Mick,

We don't have a chair Zero here to try, but Helinox claims it fits virtually any of their chairs, except for the new Swivel Chair.
Hope that helps.

G'day Ed,

We've tried this out and it's not quite right, unfortunately.
The cup holder itself slides onto the Pegasus frame, but the frame itself is abit too wide. The back of the cup holder which is designed to click onto the frame the hold it in place doesn't actually reach on the pegasus.
You might get away with it but there will be a bit of movement, so may not stay in place.

G'day Pat,

The internal diameter is 7.8cm, so fingers crossed your beer will fit in the stubby.

G'day Michael,

I've just double-checked and unfortunately, the Cup Holder doesn't suit the Helinox Camp Chair. At this point in time, Helinox only makes the one cup holder that only fits the listed models.