I made a bag from an old pair of jeans many moons ago and the denim has finally started to wear through- it's possible I've been over stuffing it! So I used a donated pair of jeans from boyfriend to make a new one. This one I made a lining with pockets to strengthen the body and also to give me some inside pockets- I found with my old bag it was slightly nightmarish to find my keys etc as everything fell to the bottom and they got lost. I did have a zombie pirate keyring that helped me find them but I recently decided to retire him.
Step 1- cut off the jean legs to create world's shortest cut offs.
Step 2/3- Sew the bottom of the legs
Step 4- Create the lining by simply copying the shape and size of the real bag, and hemming the top
Step 5/6- Look at essential items for bags to work out pocket sizes, cut out pockets lightly bigger than needed, hem the top edge of pocket then sew the other three edges (after turning them under the hide the raw edge) to the right side of the lining.
Step 8- Attach lining to bag, overlap edge of bag and edge of lining (both turned right side out) and sew
Step 9- This step is step 3, I am having an incompetent day!
Step10/11- Voila, I also tied an old belt around the belt loops to make the straps.