The Wendy backpack is a see-through vinyl bag. It features side mesh pockets, slip in vinyl pockets inside and out, and adjustable straps. Theres 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.