Abstract: Disclosed herein are improvements to fold-over structures in containers comprising two leaves foldably connected to each other along a folding line and a flap sandwiched by the two leaves when they fold together. A slot can be cut along the folding line and the flap can have an extension that is insertable into the slot to prevent the lateral movement of the flap along the long axis of the slot. One leaf can have a locking tab insertable into a slit cut in the container when the two leaves fold together in spaced parallelism to each other. An outer edge of the locking tab can extend beyond the corresponding end of the slit to secure the locking tab once inserted into the slit. The container can have a hand hole cut through both leaves and in alignment with the flap at least along the upper edge of the hand hole.