This would be a perfect beach bag. I used 20 pound dog food bags for this project. You will need 3 or 4 of them. You will also need a large poster frame, scotch tape, fabric for the lining, sewing machine, scissors, measuring tape and straight pins.Cut the bottoms off the bags and then look for where the side seam is, it will be a section about 2" wide, where the sides are fused together. Cut this off. Open up the bag and wipe the inside of the bag with a damp cloth. It is very important to cut the strips on a diagonal. These plastic dog food bags are made with tightly woven plastic strings. If you don't cut the strips on the bias they will unravel. I cut my strips about 1" wide. The strips need to be as long as the poster frame.
Step 1: Tape strips to a frame
I taped the strips to a large poster frame. Tape down both ends of each strip. Fill the whole frame. Place the strips as close to each other as you can without overlapping.