Water Bottle | Slim Flat Water Bottle 750Ml for Purse & Backpack, Leakproof Bpa-Free Plastic Tumbler with Silicone Seal, Portable Drinking Bottle for Commute/Travel/Fitness, Basiess Water Cup Pink

Cheaper than other options with this form factor. Not insulated so of course, doesn't really keep anything cool for a long period of time. That said, it does its job well; I haven't encountered any leaks or cracks in a few weeks of using it. Fits in a backpack well and better than most other water bottles with a more traditional shape and size. Functional but not fancy.