There are lots of options out there, but I'm a huge fan of this popsicle mold. It has a classic popsicle shape, can make 10 popsicles at once, and it's easy to tuck in the freezer. Plus, it's surprisingly durable! We've used it dozens of times and have had no issues with the mold breaking or cracking. You will need to keep a stash of popsicle sticks on hand, but those are very inexpensive and easy to buy, even at the grocery store. The price is great, too!