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A corner holder for use with a box of corrugated cardboard having a pair of slots in sidewalls thereof adjacent to a corner of the box, comprises a pair of inserts each including a tongue-shaped base plate and a U-shaped flange on the base plate, and a flexible connector web joined between the inser

A corner holder for use with a box of corrugated cardboard having a pair of slots in sidewalls thereof adjacent to a corner of the box, comprises a pair of inserts each including a tongue-shaped base plate and a U-shaped flange on the base plate, and a flexible connector web joined between the inserts. The base plate and the flange jointly define a channel or groove extending along opposite side edges and an arcuate bottom edge of the base plate. When the corner holder is installed on the box, the inserts are inserted in the slots, respectively, with edges of the sidewalls which define the slots being fitted in the grooves in the inserts. The corner of the box is thus clamped and reinforced by the corner holder. The box can readily be folded into a collapsed form simply by removing the inserts out of the slots.

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A corner holder for use with a collapsible box including a plurality of sidewalls having end flaps bent around box corners into superimposed relation to adjacent ones of the sidewalls, said sidewalls and end flaps which are superimposed having a pair of slots adjacent to each of said corners, said c

A corner holder for use with a collapsible box including a plurality of sidewalls having end flaps bent around box corners into superimposed relation to adjacent ones of the sidewalls, said sidewalls and end flaps which are superimposed having a pair of slots adjacent to each of said corners, said corner holder comprising: a pair of inserts insertable substantially fully in the slots in the sidewalls of the box and each including a base plate having a substantially U-shaped peripheral edge and a continuous flange of an L-shaped cross section extending outwardly adjacent said peripheral edge, said base plate and said continuous flange jointly defining a substantially U-shaped groove opening outwardly along said U-shaped peripheral edge, said U-shaped groove being receptive of an edge of one of the slots in the sidewalls of the box when said insert is inserted in said slot; and a flexible web interconnecting the base plates of said inserts and adapted to be positioned inside of the box corner when said inserts are inserted respectively in the sidewalls of the box.