Although "flat wrap" is a common industry term, we prefer "deflated wrap."
Or the German: "Deflaturwrap."

Heads of State (Sheet) Price: $ 4.25 Item Code: FWLI0001 For dog lovers, cat lovers and other stange bedfellows. Quantity: 1 flat sheet Size: 20" X 30" Printing: Litho on uncoated, 100% post-consumer waste paper Packaging: Shipped flat QTY: