This is an example of a Japanese knot bag with a long strap. I would probably wear it as a crossbody style bag.
Japanese knot bag, w/ very pretty flower
japanese knot bag - Google Search
Japanese knot bag (this is a pdf file with pattern and instructions) Been meaning to make one of these since I first saw the pattern years back.
Projects to Try
Japanese Knot Bag for the Secret Valentine Exchange: Grey Side
Free Sewing Pattern and Tutorial: How to make a reversable Japanese knot bag
Reversible Purse Martha Stewart Japanese Knot Bag Sewing Project Project Runway
Sewing & more
Actual pattern here. People clean up your pins. Please!!!!
Japanese Knot Bag to crochet using Universal Yarn's Yashi - free pattern!
The Chilly Dog: Sewing Pattern: Japanese Knot Bag