Starbucks and Dunkin' Donuts, as well as many local coffee shops, offer small discounts if you bring in your own mug. Bring it back in the same day for a refill, and the savings gets even higher! The coffee stays hot longer, and you create less waste for the landfill.
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I like the Contigo mug that's sold at Target right now. The lip flips up to drink but is water-tight when closed, and can be screwed on in two positions to work for either left or right-handed caffeination. AND the base of the handle has a caribeaner hinge so you can clip it to your backpack.