Off topic: Fabric would be the way to go, however it could be done with film if you templated the pieces prior to installing them.

Aside: In olden times before Coors was marketed nationwide guys would fly to the nearest state where it was available and stock up. (Idaho in our case) The practice was so widespread in fact that Flying Magazine, about 1975, published the dimesions and weights of the Coors packages. That made the Weight and Balance calculations for the return flight a snap. It was tough but we always waited untill the plane was tied down before tasting the cargo. We liked the Maule because it was fast and could carry a lot of cargo.