return multiple items to the same seller.

[goodluck251]

I have multiple items to return to the same seller, so i followed ebay return item direction and the seller accepted returns then I got RMA numbers for each of my return item. I want to ship all the items in the one package to save my shipping cost because i have to pay for the return shipping cost myself. Can i not use E-bay e-bay shipping labels? How can i do with the RMA numbers for each item.