The good season is approaching - or at least I hope it is! - so it'd be good to have a nice bag ready.
This shape requires little cutting and sewing, because it's a long narrow stripe. It's fun and quick to plan and weave, but any other long stripe of fabric will do.
This is how the stripe is folded to obtain the bag - the proportion between handle and bag can be varied, depending on how you are used to carrying it.
The finished stripe is about 17cm wide and the total length is about 230cm, not including the inside pocket.
If you want a pocket, you have to plan a little more warp length, in order to have an extra fold that you can keep to the inside (or even the outside!) of the bag.
If you like, you can round the corners at the bottom and add a nice lining - this one is made of cotton and goes in the washing machine with no problem.