Nalgene

Tritan OTG Bottle

Love this bottle! The cap is sturdy and water-tight. No flimsy tethers to keep the cap attached to the bottle. Carry ring makes it easy to take along on walks. See-through plastic is perfect for seeing how much water is left and how clean the bottle is inside. Only drawback is that as it ages, the cap gets looser and can start popping open -- especially if you drop it. (Not that big a deal, usually.)