A while ago I posted some gift-boxed cards I had made, with a promise to write a tutorial on how to make boxes for standard A2 sized cards (4 1/4" x 5 1/2") as well as pointers on how to adapt the box to fit anything.
I'll start with the dimensions for the A2 box. Below that, you'll find pointers on making your own box of any size. Be sure to see my finished project towards the end of this post!
This box is intended to have a clear acetate/transparency lid so that the contents can be seen. If you don't have anything like this to use, no worries - simply substitute a piece of card stock and cut and score accordingly. If you're using card stock, you'll want to embellish the lid, probably in a manner similar to your cards (do any embellishing/adhering before folding the flaps in and adhering them to form your lid).
You will need:
card stock cut to 8 3/8" x 9 3/4"
transparency/acetate cut to 6 1/4" x 7 5/8"
paper trimmer with scoring blade
bone folder
sticky strip (or other strong adhesive)
glue dots
You'll also need this .pdf template file with cutting & scoring dimensions.
Box Bottom
Start with the 8 3/8" x 9 3/4" piece of card stock. Score at 7/8" and 1 7/8" on all four sides (Note: those fractions look funny when I preview this post. To be very clear, it reads "Score at seven-eighths and one and seven-eighths on all four sides").
Sharpen all creases with a bone folder. Hint: When making boxes or 3-D projects of any kind this step is really very important. It's the only way you'll get nice, crisp edges.
Remove the corner pieces as indicated in the pattern. Here's a quick shot (it's slightly blurry - sorry about that!):

Cut along the score lines where indicated with red on the pattern. Flip the card stock over and apply small pieces of sticky strip or glue dots on the reverse side of the little flaps that you just cut (you're looking at the bottom of the box):

Turn your card stock back over and apply sticky strip as pictured below. You're now looking at the inside of the box. Hint: If you wanted to stamp the bottom of your box with a "hand stamped by" stamp, now's the time, while it's still flat!

Remove the liner from the sticky strip on the little flaps. Fold them in and adhere them to the inside of the long sides of the box as shown:

Remove the liner from the sticky strip on the long sides of the boxes. Carefully fold them in and press firmly to adhere. Hint: I set the box on its side and used the tip of the bone folder to firmly rub the flap - this ensures a 'good stick'. Now your little flaps from the previous step should be covered, for a nice clean look.

Repeat the step above for the two short ends of the box. Your box bottom is now complete.
Box Top
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Cut a 6 1/4" x 7 5/8" piece of acetate or transparency.
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Score at 7/8" on all four sides. Carefully sharpen the creases with a bone folder.
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Cut along the score lines where indicated on the pattern.
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Turn your lid so that the top of the lid is facing up. Place adhesive (if working with a transparency or acetate, your adhesive must be clear: a small piece of sticky strip or a glue dot) on the small flaps that you just cut in the previous step. Sorry - no photo here - it's too hard to photograph clear adhesive on a clear lid!
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Turn the lid top-side down. Adhere the little flaps to the inside of the long sides of the lid. Your lid is complete!
Now place your cards and envelopes into the box. If desired, place a ribbon around the box to hold it closed.

Here's a shot of one of the cards:

This card was CASEd from page 81 of the previous Stampin' Up! catalog - the Spring/Summer 2009 Idea Book & Catalog. I kept the same layout, but changed up the papers and colors. I used the versatile Friends 24/7 Stamp Set (#113218). The Rose Red patterned paper is from the brand new Thoroughly Modern Designer Series Paper Pack (#115673). The bird and sentiment are popped up on dimensionals - here's a closer look:
Still with me? Here are instructions you can use to determine the dimensions for a box of any size:
Measure what you want to enclose in a box: width, length and height. If you will be boxing cards and envelopes, make sure that you are measuring the width and length of the envelopes, as they are slightly larger than the cards! And yes, I'm speaking from experience here!
Using the example of my box above, here's how to determine the size and score lines of the box bottom:
My envelopes measure 4 3/8" x 5 3/4".
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Add 1/4" in both directions for a nice comfortable fit. The size of the actual bottom of my box is 4 5/8" x 6".
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My box needed to be 1" tall. Subtract 1/8" from that to determine the width of my fold-down layer - that's 7/8". Remember the two score lines on the box bottom? The first score line is to fold down, the second score line is for the actual side (height) of the box. The layer that folds down needs to be slightly smaller than the side of the box.
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Add the fold-down layer to the desired height. That's 1" + 7/8" added to BOTH sides of the length and BOTH sides of the width. Sketch it out - it helps!
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For the length, add 5 3/4 + 1 7/8 + 1 7/8. Converting your fractions, that's 5 6/8 + 1 7/8 + 1 7/8.
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For the width, add 4 3/8 + 1 7/8 + 1 7/8.
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This will give you the size that you cut your card stock to. The height and fold-down layer numbers determined in step #2 above give you your scoring measurements. Score the fold-down layer first (7/8"), then the actual side of the box (7/8" + 1"). Score at these measurements on all four sides.
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Cut the corners away and snip along the score line as in the pattern provided above. Assemble & adhere as above.
Using the example of my box above, here's how to determine the size and score lines of the box top:
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Start with the dimensions of your box bottom. Again, using my example above, my box bottom (assembled) measures 4 5/8" x 6".
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The lid should be slightly smaller than the bottom for a nice fit. Subtract 1/8" from both the length and width. The top of my box should measure 4 4/8" x 5 7/8".
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The sides of your lid should be slightly less than the height of your box. My box is 1" high. Subtract 1/8" inch - the sides of my lid need to be 7/8".
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Add the side measurement two times to both the length and width of the lid: For the length, add 5 7/8" + 7/8" + 7/8". To determine the width, it's 4 4/8" + 7/8" + 7/8". This will give you the size (length and width) of the acetate or card stock that you're using for the lid.
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Score in at the measurement of the sides of your box lid - here, 7/8". Score on all four sides. Sharpen score lines and snip along score lines where indicated on the pattern. Assemble as above.
That's it! Not so difficult, just a little tedious with the measuring and arithmetic. I highly recommend sketching out your box and lid (with measurements). I also suggest you try out your box on a piece of scrap/copier/printer paper first. Try fitting your contents into the test box. Do the same with the lid and make sure that the lid fits easily into the box bottom. Have fun, and happy crafting!