Thank you everyone. I was hoping it will cover all costs lol oh well. Thanks guys.

You can use the 'Forever Stamps' anytime for a long time. It will be considered a first class stamp everytime a new stamp comes out.

Yes, a Forever stamp just means that whether u pay 41 cents for it now, it will be worth whatever the cost of stamps is at the time its sent. So say you send an SASE now and put two forever stamps on it. If they don't get around to replying until after the cost of postage goes up they will still be good, because they will be worth whatever a stamp currently costs at the time. Get what I'm saying? Hopefully I was of help. =)

Yep, you will need to put two stamps on the envelope.

BossC

Oh ok so I'll still need to add two stamps then onto the 9x12 envelope? That stinks I was hoping it would cover the whole cost. Thanks

Forever stamps are worth as much as one first class stamp.

I have a question about them. If I am sending a 9x12 envelope do I still need to stick on two stamps or can I do one stamp now? I don't quite get the concept of forever stamps. If someone could please tell me that'd be great