When I play I find managing my own rubies get's a little fiddly (they like to 'snap' to various spots on the player mat), I tend to create my own bags and put the rubies into there.

Seeing as the player mat shows them in a bag anyway, seems to make sense to me to have that by default :)

(I'd happily make a PR with the changes in if this was on GitHub or such :'D )