Bulk shipping container having adjustable height, collapsible walls

1. A collapsible container having adjustable height walls, the container comprising:

a base defining the bottom wall of the container;

an opposing pair of side walls and an opposing pair of end walls, the side walls and end walls comprising first hinges that pivotally connect the side walls and end walls to the base, wherein the side walls and end walls are pivotable between an upright position and a collapsed position over the base;

the side walls and end walls further comprising first latches to releasably engage respective adjacent pairs of side edges of the side walls and end walls when the side walls and end walls are in their upright position; and

the side walls and end walls each further comprising extension walls movably connected thereto between a nested, unextended position and an upright, extended position,

wherein the extension walls further comprise second latches to releasably engage respective adjacent pairs of side edges of the extension walls when the extension walls are in an upright, extended position;

wherein the extension walls are slidably mounted adjacent to each respective side wall and end wall to allow movement of the extension walls from the nested, unextended position to the upright, extended position;

whereby the container is collapsible for storage and has extendible side walls and end walls.

2. A collapsible container as described in claim 1 , wherein, when the side walls and end walls are in the unextended position, the extension walls are mounted on the outside of the container.

3. A collapsible container as described in claim 1 , wherein, when the side walls and end walls are in the unextended position, the extension walls are mounted on the inside of the container.

4. A collapsible container as described in claim 1 , wherein each of the side walls and end walls further comprise a lock for releasably fixing the extension walls with respect to each respective side wall and end wall.

5. A container having adjustable height walls, the container comprising:

a base defining the bottom wall of the container;

an opposing pair of side walls and an opposing pair of end walls;

the side walls and end walls each comprising extension walls movably connected thereto between a nested, unextended position and an upright, extended position,

wherein the extension walls further comprise latches to releasably engage respective adjacent pairs of side edges of the extension walls when the extension walls are in an upright, extended position;

wherein the extension walls are slidably mounted adjacent to each respective side wall and end wall to allow movement of the extension walls from the nested, unextended position to the upright extended position;

whereby the container has extendible side walls and end walls.