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This review is from: Contigo Aria Autoseal Stainless Steel Mug - 470 ml, Grey/Black (Kitchen & Home)
We bought a second one of these as they are the only sippable travel mug that really doesn't leak. Amazing! I was going to buy one of the other models to get a coloured mug, but I see that this is the only type currently that has the locking function which is pretty essential if you want to shove it in your bag with other things.