Interlockable structural members and foldable double wall containers assembled therefrom

A end to end interlockable structural member for assembling a double wall comprising:

• a pair of spaced apart parallel panels, the panels being staggered in a longitudinal direction so that an extension end section of each panel extends in the longitudinal direction beyond a non-extension end of the other panel, each panel being formed with a channel extending in a widthwise direction across the panel;
• a first and a second connecting wall, each connecting wall joining the non-extension end of a panel to the other panel, the first connecting wall having a notch therein;
• a flange wall extending at an angle from the extension end section of one panel so as to define an open flange receiving cavity between the second connecting wall, said extension end section and the flange wall, said flange wall having a head which is engageable with the notch of another identical structural member;
• a flange belonging to the extension end section which extends beyond the first connecting wall, the flange comprising a side wall originating at an angle from said extension end section to a terminal point;
• a first lip, originating at an angle from the extension end section to which the side wall belongs at a point along said extension end section which is more distant from the first connecting wall than the side wall is, said first lip being snugly receivable in a channel of another identical structural member;
• and
• a second lip, originating at an angle from the extension end section to which the flange wall belongs at a point along said extension end section which is more distant from the second connecting wall than the flange wall is, said second lip being snugly receivable in a channel of another identical structural member;
• said flange receiving cavity, flange wall, head, flange, notch, channels, first lip and second lip being of dimensions and being adapted such that:
• the flange receiving cavity is capable of completely receiving the flange of another identical structural member;
• the second lip is capable of being snugly received within a channel of said another identical structural member;
• a channel is capable of snugly receiving the first lip of said another identical structural member;
• and the head of the flange wall is capable of engaging and cooperating with the notch of said another identical structural member, so as to resist separation of the structural member from said another identical structural member.