Abstract
A foldable blank is disclosed. The foldable blank includes a base, a first sidewall, a first flange, and a restraining feature. The first sidewall is connected to the base. The first flange is connected to the first sidewall. The restraining feature is located in at least one of the base and the first sidewall. Each of the base, the first sidewall and the first flange are constructed from a polymeric sheet. The restraining feature is a permanent imprint in the foldable blank. The foldable blank is generally planar with the exception of the restraining feature. The foldable blank may be erected to a folded tray. The folded tray may be connected with a lid to form a package. The package may be suitable for non-hermetic applications.