I love DIY projects that use objects that we would otherwise throw away and convert them into something super useful. With two kiddos who love to color, we've a hodge podge of crayons - some bought, some gifted, and some were freebies from restaurants or airplane rides. To replace our near broken crayon box, I made a sturdier crayon case using plastic water bottles, hot glue, and a zipper. The kids love zipping and unzipping the case, and they learn about re-fashioning things we already have into something new. Anytime I don't have to buy something new, I'm super happy.
Remove the label from your plastic bottles. With a sharp pair of scissors, cut the bottles down to the size desired. Since I was making a crayon container, I made mine short and stout. For taller items liked colored pencils, be sure to cut your bottom bottle longer with a short top bottle.
Attach your zipper pull onto your zipper (if not already attached). Then cut about 1" of the teeth off the top.
Hot glue the top ends down.
Wrap your zipper around your bottle and cut to fit with about a 1/2" overlap.
Glue one side of your zipper inside your bottle, with the zipper facing outward. Leave about 1/8" clearance between the zipper teeth and the edge of the bottle so that your zipper has enough space to slide easily without hitting the bottle edge.
Hot glue the zipper all around the inside of the bottle, being careful not to get any glue on the teeth. At the end, hot glue the overlapping zipper fabric over the underlying layer of fabric.
Now hot glue the other side of the zipper to the inside of the other plastic bottle, being careful not to get any glue on the zipper teeth.
Your zippered plastic bottle case is now done! The added bonus of these containers is that you can easily see what's inside for easy organizing.