Custom Tray Boxes in Waterloo, IA

RSC (Regular Slotted Container) boxes are the most commonly manufactured corrugated box style in the world — a simple, efficient design where all four top flaps and all four bottom flaps extend from the box's four side panels and are slotted at the corners to allow folding without overlapping. When closed, the top and bottom flaps meet (or slightly overlap) in the center, creating a simple, flat closure that requires tape or stapling to secure.

RSC Construction Geometry

The RSC's defining characteristic is its slotted corners — the gaps between adjacent flaps that allow the flaps to fold flat without interfering with each other. These slots create the rectangular gaps visible at each corner of the closed RSC box. The flap depth is designed to be exactly half the box width, so that opposite flaps meet precisely in the center when closed. When flap depth is less than half width, a gap remains in the center; when greater than half width, flaps overlap — the designer specifies flap depth for the desired closure behavior.

RSC Advantages

The RSC's global dominance in corrugated shipping packaging is attributable to its extraordinary efficiency: maximum material yield from the corrugated sheet (the slotted corner design wastes minimal material), compatibility with automated box-making equipment (RSC cuts and scores are the simplest production format), compatibility with automated filling and closing equipment (all flaps fold in the same plane), and maximum stacking strength (the closed RSC's corner columns are continuous from base to top, maximizing vertical load distribution).