What's the oven capacity for PAX devices?

PAX 2, PAX 3 and PAX Plus oven holds about 0.35 - .5 grams of ground material.

PAX Flow oven capacity is up to .40 grams.

PAX Mini has a shallower oven than the rest, allowing for about half the capacity of ~.20 grams.

The Half Pack Oven Lid (available here), allows you to use about 0.17 - .25 grams of material in the oven for smaller/shorter sessions. Note compatible with PAX Mini.

These amounts may vary with moisture content and level of grind, but not by much.