A joint for use in making a shipping crate includes a base and a pair of orthogonal channels which extend upwardly from the base and are open from above. Each channel has an inner closed end and an outer open end, and has a width, along a length of the channel between the inner and outer ends, which is greater than the width at the inner and outer ends. The channel is preferably defined by an outer wall, an inner wall, and a pair of reinforcement members located at the inner and outer ends to define the region of smaller width at each end. The reinforcement members are preferably hollow vertical members which are rectangle or square in cross-section and which extend from the inner wall towards the outer wall. Preferably, at their inner ends, the channels share a reinforcement member.