Shipping insert and blank for forming same

An insert formed from a one-piece blank of sheet material, the insert comprising:

• a first half comprising a first plurality of panels connected in series at respective fold lines;
• a second half connected to the first half and comprising a corresponding, second plurality of panels connected in series at respective fold lines;
• a first end comprising lateral extensions extending from first opposing ends of two panels from each of the first and second plurality of panels;
• a second end comprising lateral extensions extending from second opposing ends of the two panels from each of the first and second plurality of panels
• wherein the first and second ends each further comprise a plurality of inner end flaps, a corresponding plurality of outer end flaps, and a plurality of locking panels, wherein each locking panel, when in a locked position, extends over one inner end flap and one corresponding outer end flap;
• and
• a plurality of popout tabs extending outward from an outer surface of the insert;
• wherein the first half defines a first internal receiving area and the second half defines a second internal receiving area, the first and second internal receiving areas each being surrounded on all sides and on opposing ends by at least one of:
• (i) two layers of the sheet material, or (ii) an air gap defined between the outer surface of the insert and an adjacent portion of an overwrap material by the popout tabs or the lateral extensions forming the first and second ends.