It's been a while since I messed with an "Easy" but if I remember correctly, you are throwing out the little connector piece each time and can't choose the size of your bags because the bag and connector piece are attached to one another. You have to buy a whole new connector/bag combo when your bag needs replacing.
With my solid valve, I grab turkey bags from the grocery store, cut them exactly how big I want them, and stick them on there.
Check this out:
http://volcanotips.com/volcano/solid...vs-easy-valve/
Someone in the comment section there was talking about a way to be able to replace your "easy" bag without tossing the connector piece. Maybe it's possible but it just doesn't seem worth the trouble as it then makes the "easy" less easy than the alternative. I love my solid.