If you're coming over from my video tutorial, here are the raw fabric dimensions for you:

Front, Back Panel: 9" wide, 12.5" tall each (approx. 23 cm x 31.75 cm)

Side panel: 15" wide, 41" long (approx. 38 cm x 104.25 cm)

Front Pocket Top Piece: 7" wide, 5" tall (approx. 17.75 cm x 12.75 cm)

Front Pocket Bottom Piece: 7" wide, 6" tall (approx. 17.75 cm x 15.25 cm)

Front Handle: 23" long (approx. 58.5 cm)

Back Adjuster Strips: 2.5" long (approx. 6.25 cm)

Back Straps: 80" long (approx. 203.25 cm)

Zippers: 3x13" long (approx. 33 cm)

This will get you the mini backpack, but if you'd like to see the dimensions for other sizes here is a guide for the mini and the classic, as well as three laptop sizes.

Here's the video!