Briggs and Riley : Wheeled Expandable Uprights

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The Expansion Device is unique to Briggs and Riley.
 Not only does it make it easier to expand about 25% more room, it also gives a firm wall to pack against.  Other manufacturers use only a zipper track which does not make it easy to pack when expanded.  The Briggs system is far superior with 2 "push button" devices inside. 
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