From the online manual at http://www.miragesys.com
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Fold back the main container flaps. Place the main bag into the main pack tray. IMPORTANT: Make sure the line stows go to the bottom of the container. [Fig. 7] Helpful Hint: To get the best fit into the main container insert the main bag with bridle grommet against the reserve container first, then rotate the bag with the lines towards the bottom of the container. Make sure the bag fills the bottom corners. With the bulk evenly distributed the main container will have a smooth appearance.