You mentioned the Armiger being a storage - or "hammerspace" - correct? I imagine you'd have to get by with pockets, like the rest of us.

[It's said teasingly, with a friendly smile. She's not out to steal your hammerspace powers, but the ability to summon her staff from the Armiger would be so good you've gotta admit.]

I suppose most magical systems would function well under the umbrella law of "intention". So long as you know what you intend to do, the effect manifests in whichever way is most familiar to your desire. It's terribly convenient that so many different worlds pool here, where the environment is so flexible.