ロームボトル

Filled it with ice water before a 6am hike and there was still ice clinking around at lunch. The leakproof lid survived rolling around in my backpack all day without a single drip.

Left it in a hot car all afternoon and the water still had ice clinking around at dinner. The four-way pour lid is genuinely handy when I'm filling two cups at once. Only gripe is it's a bit heavy when full, but that's the tradeoff for 36oz.

Filled it with ice water before a hike and there was still ice rattling around six hours later. The lid pours from four directions which sounds gimmicky but actually helps when you're holding it one-handed. No leaks in my bag either.