Abstract: A valve to be mounted on a dunnage bag having one collar mounted on the bag, a seal plate positionable adjacent to an interior end of the collar and a stem slideably mounted in the collar to position the seal plate in one position where air is prevented from passing through the collar and in another position where the seal plate may be locked permitting air to escape from the bag.

Abstract: An apparatus and method for storing boxes of perishable products and providing that refrigerated air flows relatively uniformly through the stack. The apparatus is an elongated inflatable bag divided into sections by baffles, each section being inflatable independent of the other sections. The bag forms a roof over a corridor between two rows of stacks and a panel encloses one end of the corridor opposite the opposite end which is closed off by the cargo wall. Refrigerated air forced into the corridor at floor level at one end of the corridor is diverted through the stacks of boxes.