Permanently Self-Locking, No Spill Back Lip
Sturdy, one-piece, die-cut, high-quality, oyster-white, 200 lb. test, B-flute corrugated board bin cartons. Self-locking construction; assembled in seconds and will not come apart. Reinforced 4-ply, 4-1/2" high back-lip catches underside of upper shelf to give easy angle-access to content of carton and prevent spilling.

NO-SPILL LIP
1/2" lip on back of bin secures it when fully extended for use. It catches on underside of upper shelf and leaves both hands free.