Flanged tray with gusset corners

A tray having gusset corners for forming a leakproof container for packaging food or the like comprising:

• adjacent side walls and a bottom wall of said tray;
• a pair of gusset panels connected by a center fold line extending from adjacent a point of intersection between said side walls and said bottom wall;
• a pair of side fold lines extending from adjacent said point connecting the respective gusset panel to the adjacent side wall;
• both side fold lines and the adjacent sealing portions of the gusset panels extending the full depth of said side wall;
• a cut-out in the inner gusset panel when folded for erection, said cut-out extending from said center fold line to said sealing portion of said inner gusset panel;
• the sealing portion of said inner gusset panel being a narrowed member defined by the adjacent side fold line and the adjacent edge of said cut-out,
• the outer gusset panel opposite said cut-out when folded for erection extending through said cut-out for bonding to the facing side wall;
• a bond area between said outer gusset panel and the facing said wall defined by said cut-out, whereby said gusset corner is securely held against said facing side wall for reinforcement of the corner sealing along the full depth of said side wall.