Abstract: The invention provides a backpack comprising: a shell having: a back wall; a bottom wall; a left side wall; a right side wall; and a front wall, the front wall having a height less than a height of the back wall, wherein an opening is defined between upper edges of the back wall, the side walls and the front wall; a cover having a periphery engaging the upper edges and covering the opening in a closed position; a pair of lower arms and a pair of upper arms, each arm having a proximal end pivotally mounted to one of: the right side wall; and the left side wall and a distal end pivotally mounted to one of: a right portion and a left portion of the cover respectively; and wherein a pair of four bar linkages are defined by the lower arms, the upper arms, the right and left side walls of the shell, and the right and left portions of the cover.

Abstract: The invention provides a backpack comprising: a shell having: a back wall; a bottom wall; a left side wall; a right side wall; and a front wall, the front wall having a height less than a height of the back wall, wherein an opening is defined between upper edges of the back wall, the side walls and the front wall; a cover having a periphery engaging the upper edges and covering the opening in a closed position; a pair of lower arms and a pair of upper arms, each arm having a proximal end pivotally mounted to one of: the right side wall; and the left side wall and a distal end pivotally mounted to one of: a right portion and a left portion of the cover respectively; and wherein a pair of four bar linkages are defined by the lower arms, the upper arms, the right and left side walls of the shell, and the right and left portions of the cover.