Rectangle boxes are similar in construction to square boxes but there are two different measurements for the sides.   Basic measuring rules for rectangle boxes Bottom paper measurements = width of box + 2 times the height by length of box + 2 times the height. For example a box that measures 3 by 4 with a height of 2 3 + 2 + 2 by 4 + 2 + 2 7 by 8 Scored on all 4 sides at 2.   Lid measurements = width of box + 2 times height of lid + 1/8 by length of box + 2 times height of lid + 1/8 For example a lid to fit a 3 by 4 box with 1 sides. 3 + 1 + 1 + 1/8 by 4 + 1 + 1 + 1/8 5 1/8" x 6 1/8" Scored on all 4 sides at 1.
 Rectangle Boxes
 Step 1:  Cut bottom  paper 7 by  8  (3 + 2 + 2 by 4 + 2 + 2)   Step 2: Score all 4 sides at 2.   Step 3: Cut the score lines of the shorter sides up to the first vertical score line.   Step 4: Turn paper so outside of box is face up, apply Scor Tape to the corners and assemble box with taped sides inside the box.
 The following instructions are for a rectangle box 3 by 4 with 2 sides and a lid with 1 sides.
 Step 5: Cut lid paper to 5 1/8 by 6 1/8 (3 + 1 + 1 + 1/8 by 4 + 1 + 1 + 1/8) I punched an opening in the lid ( see Helpful Hints and Ideas)   Step 6: Score all 4 sides at 1.   Step 7: Cut score lines on shorter side up to the first vertical score line.   Step 8: Turn paper so outside of box is face up, apply Scor-Tape to corners and assemble with taped corners inside the box.
 Helpful Hints and Ideas ·  Use heavier card stock or designer paper for sturdier construction. ·  Double sided designer paper can add additional interest to your boxes. ·  Before assembling your lids consider cutting a circle or oval in the lid and   adhering acetate to the underside.  This will create a fun peek into the contents of your box.  Add rub-ons or stamping to the acetate.  · Add ribbon pull tabs to your lids for easy removal. · Embellish your boxes and lids with scallops, ribbon, buttons, etc  · Stack several square flat boxes of varying sizes to make a cake. · Use the bottom box measurements to create a holder for a goodie bag.