Does anyone have any ideas for where I can get some clear plastic that I can use to sew a window in an insulin pump pack? My ds uses a pump pack that is a stretchy velcro belt with a zippered boxy pocket attached. The front is clear, soft plastic. I keep spending $30 on these pump packs that last a few months and take forever to dry. It would be easy to make one (in fun fabrics, too) but I need something to use for the front so that we see our son's pump without taking it out of the pack. Any ideas?