their respective vertical score lines s1 s2 s3 and s4 only their bottom flaps 12b 16b 18b 20b and 22b being seen in fig2 so that the back wall portion 12 is brought around outside of the tongue t1 t2 and t3 only the bottom tongue t3 being seen in fig2 so that the outer vertical edge 14 of the back wall portion 12 may be secured to the outer edge 14 and glue strip 15 over and in contact with the edge part 24 which is between the lines 1 1 and 1 2 in fig1 thus the wall portions of the carton blank 10 are formed into a collapsed tube for shipment from the manufacturer to the packager for clarity the wall portions only their bottom flaps being seen in fig2 are indicated as not completely collapsed and just before they are laid flat for shipment when he is ready to fill the container with articles such as bicycle parts for shipment the packager first erects the blank wall portions into a squared up condition so that it begins to look like a container indicated at c as seen in fig3 since the packager must first erect and close the bottom of the box before filling it fig3 shows the container c bottom up with two 32 and 34 of the three internal struts formed by folding and locking their parts together and just before closure of the bottom after squaring up the box the parts p2 of the center tongue portion t2 are folded around.