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

Frosty Friday (Sheet) Price: $ 4.25 Item Code: FWLI0003 Some see a humble frost fence, Whigby sees emerald diamonds. Quantity: 1 flat sheet Size: 20" X 30" Printing: Litho on uncoated, 100% post-consumer waste paper Packaging: Shipped flat QTY: