Simple Modern makes dependable drinkware, and the Summit 18oz Tumbler in the Sweetheart colorway is a solid choice for toddlers and young kids. The key differentiator here is the leak-proof straw lid. It’s not just about preventing spills. It means you can toss this into a diaper bag or a preschool backpack without finding a puddle of milk on your car seat later.

The tumbler is built from double-walled, vacuum-insulated 18/8 stainless steel. That keeps water cold for hours, even on a warm afternoon at the park. At 18 fluid ounces, it’s a practical size for small hands without being too heavy to carry. The entire thing is dishwasher safe, which matters when you’re washing the same cup every single day. The Sweetheart finish has a smooth, matte texture that feels nice and doesn’t show fingerprints as much as glossy plastic.

One thing to note: the straw lid is leak-proof when closed, but it’s not a fully sealed lid for hot liquids. Stick to cold water or milk, and you’ll be fine. For a travel cup that survives the chaos of a toddler’s day, this does the job without fuss.