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That flip straw is honestly the most hygienic setup I’ve used—no more digging around for a dirty lid. It’s been in my car’s cupholder all week, and not a single drop leaked even with the straw down.

I was skeptical about the "completely leakproof" claim, but I literally tossed it in my beach bag with the straw down and not a single drop escaped. The circular flip straw is surprisingly easy to sip from one-handed while driving, and it's kept my ice water cold for hours.

Fits in my car's cup holder perfectly, which is rare for a 40oz. The leakproof lid with the straw down gives me total peace of mind tossing it in my work bag — no surprise puddles.