Here is the instruction online: https://www.instructables.com/id/Leather-Shell-Sling-Bag
We developed some Acrylic templates, by using it, you no need to draw lines on the leather, just use knife to cut leather directly, save you some time.
But we should admit that acrylic pattern is not as detailed as downloadable pattern, downloadable pattern has more hits on it.
We use 2.0mm acrylic board, after lots of test, 2.0mm is the best thickness.
For this pattern:
The finished size is about: 6.5" x 6.9" x 3.0" (16.5cm x 17.5cm x 7.5cm).
Hardware: 831 snap x1.
Leather: We advice 2.0mm (5oz) leather, size 39cm x 51cm, 3mm leather cord 2m.
If there is no in store, we normally need 2-3 days to product, please be patient, thank you!