upwardly past the center portion 48 edge sides 16 and 15 of the first ply extend upwardly at 19 and 20 similarly edge sides 46 and 45 extend upwardly at 49 and 50 on fourth ply 41 a small compartment is formed on the first ply by a top wall 51 and an inside wall 52 on edge side 16 and by a top 53 wall and an inside wall 54 along edge side 16 a handle half 55 is connected between insides 52 and 54 the compartments are indicated by reference character 56 similarly fourth ply 41 has compartments 57 which are formed with walls 59 and 60 and walls 61 and 62 a second handle half 63 is supported by walls 61 and 62 there are two pairs of latches a set of first or lower latches indicated generally by reference characters 65 and 66 and a pair of upper latches 67 and 68 each latch has a pair of recesses 69 into which a latch 70 is operated latch 70 is pivotally held in recess 69 by a pivot pin 71 which passes through a pivot pin opening 72 in latch 70 and is held by an opening 73 in recess 69 latch 70 moves from the unlocked position shown in phantom view in fig7 to a locked position as shown in solid lines in fig7 where the latch opening 74 is snapped over latch pin 75 which is held in latch pin opening 76 at the base of recess 69 latch opening 74 is narrowed as shown for instance in fig8 at reference character 77.