These divine magic spells are presented for PenDragon Pass, but you should be able to convert to RuneQuest fairly easily.
A person can be a member of more than one ring.
For each point of spell used, one air spirit can be captured in the bag, using normal binding rules.
The bag can also be used to capture a gust of wind. Match the users POW against the winds STR -- success means the wind has been captured in the bag and can be released later. Each extra point of spell used to create the bag reduces the winds STR by 20 for purposes of capturing it.