Kristi, you can always reuse the bags in the next BOOM...... The flatter the bag lays the better so try to avoid the ones that have that bulky rectangle that slides the seal shut for you.
Also, padded envelopes will be sent to you for free from the post office if you order them online.
https://store.usps.com/store/product...elope-P_EP14PE
I see that they have forever padded envelopes available now, too. Those aren't free ($8.55 each) but I might just get some.
https://store.usps.com/store/product...4pe-P_PPEP14PE