LQQKs like you have plenty of answers - so I will leave you with a *.
Here,s the site http://www.sewing.org Go to teen projects the project is Beach Towel Carryall
Here's a site with a lot of free craft patterns. Possilbe one of these would work for you.
http://www.craftandfabriclinks.co...
I have a pattern at home...I am out of town until tomorrow. If you would like I can send it to you by email. This is a large bag and it takes grommets around the top and you put a nautical rope (or any kind of rope) through the grommets for the handle. My email is boxbuttedems@bbc.net if you would like me to email the pattern this weekend let me know.
Mona