This was a very easy bag to make, I didn't use any patterns or guides. Basically all you need to do is cut a long rectangle out of fabric and fold in half ( cut to how big you want the bag)
then sew up either side,
once that is done, hem around the top leaving enough room to thread the elastic through
Sew up the elastic so that it wont snap
Cut out a simple strap and sew it on!
For something extra I added the buttons by hand :)