I've been using the CUPKIN Toddler Tumblers for a few weeks now, and they're a mixed bag. The powder-coated stainless steel looks sleek—way better than plastic kiddie cups—and the stackable design saves space. My toddler loves holding them because of the textured grip, and the colors (brown + peach) haven’t faded despite daily use.

But let’s talk leaks: they’re *not* leak-proof. At all. I learned this the hard way when my kid tossed one into her backpack. The silicone straw seal is tight (too tight, honestly), making it frustrating for little ones to sip smoothly unless you crack the lid open—which defeats the purpose. Also, dropping these cups *will* dent them (ask me how I know).

Cleaning is easy—dishwasher-safe lids/straws are a win—but the straw quality is meh. We swapped them for reusable metal ones. And while they’re marketed for ages 2+, my 18-month-old struggles with the suction required.

Verdict? Cute and durable-ish, but flawed for active toddlers. Worth it if you’re okay with trade-offs.