I use 8 grams
Rachel, i'm sorry, i have no idea why the link don't work. Front and back a panel size 23*38 cm. The sides of the backpack are 8 * 38 cm. The lower part of the backpack 8 * 23. Dimensions do not include allowances. The specific intermediate steps you can ask me at any time if interested in.
And I posted a picture of final result. :)xo
Lau5ren, Thank you so much! But I'm not heavily made-up here :)