The Wendy backpack is a see-through vinyl bag made with 10 gauge vinyl. It features side mesh pockets, slip in vinyl pockets inside and out, and adjustable straps. There's a video walk through if you need extra help including tips and tricks for sewing vinyl. Wendy comes in three sizes: full, medium, and small. The full size measures 16.5" x 18.5" x 5" and fits quilts, blankets, coats, and snacks for game nights, stadium events, and concerts. The medium measures 15" x 16" x 4" and makes a nice "day pack". The small measures 12" x 13" 3" and is a great purse size or little kid backpack size. Use a teflon foot for ease of sewing.