Envelope for forming playground or sports area defining structure during e.g. competition, has flat and rigid ends and compartmentalized bottom that are foldable on one another, when envelope is not in usage configuration

摘要

The envelope (1) has flat and rigid ends (2, 3) perpendicularly positioned with respect to a compartmentalized bottom (6) and defining a receiving zone between them for receiving a cylindrical inflatable element (7). The ends and the bottom are foldable on one another, when the envelope is not in usage configuration. The bottom has two compartments for receiving rigid plates. A connection unit is formed by a Velcro(RTM: hook and loop fastener) type self-gripping strip (4) arranged near a top part of the end (2).