For what it's worth, I use this mug (http://www.gocontigo.com/catalog-product-detail;catalogproducts,cdf58f9d3e66b170ae56fcdafcb9b2f1.html) and I love it so much I bought a second one. It's available at Target. Stainless steel inside, easy to open and close with one hand, seals marvelously, easy to use carabiner handle that clips onto everything in the world. Perfect. Also, I haven't broken it! Them!
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For what it's worth, I use this mug (http://www.gocontigo.com/catalog-product-detail;catalogproducts,cdf58f9d3e66b170ae56fcdafcb9b2f1.html) and I love it so much I bought a second one. It's available at Target. Stainless steel inside, easy to open and close with one hand, seals marvelously, easy to use carabiner handle that clips onto everything in the world. Perfect. Also, I haven't broken it! Them!