highest quality elastic bands for a lasercut leather pe Sewing Machines Parts and Sales in Los Angeles

Hey mates,

I want to make my crush an pencilcase because she draws so fantastic pictures.
Fortunately i have access to a good lasercutter so i can stitch the pieces per hand with bigger thread and have perfectly cut edges.
I will post the svg files for everyone when she has the first prototype in her beautiful hands.

My plans are:
– 2,5mm thick cow leather for the backside, maybe something thinner here?
– with 44 cm height 22 cm

i like this design alot http://www.instructables.com/id/DIY-Pencil-Roll-Case/ but i dont think she will always put the same pencils in there so i’m looking for an idea to fit them snug in there.

Another idea is something like this:
http://www.instructables.com/id/Laser-Cut-Leather-Tool-Roll/

My best way is to go with high quality elastic band isn’t it?
so i can sew this per hand in premade holes.

Thank you in advance