Hi Mary Mo: you can exchange up to 10 packages of 15 each. If we have over 10 people, and you decide to exchange the full 10 baggies, then you will receive 10 baggies back (One from each person). I have yet to have swaps where we haven't had at least ten people playing along, so no one got one of their own packages back.
You can keep as much of your own fabric you want
Does that help?