Hydro Flasks insulated bottle with flex cap lid is an all-around option that will serve just as well at the office as it will in the backcountry. The double-wall vacuum insulation keeps hot liquids hot for 6 hours and cold liquids cold for 24 hours, and it eliminates condensation so you wont have to worry about puddles forming on your desk or in your backpack. Its BPA-free and resists absorption, so you won't be drinking yesterdays leftovers!