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The top is not meant to prevent spilling, only to keep heat in a little longer, please read the product description. Cups that fit into cup holders are generally taller than they are wide -- a NEGATIVE for backpacking. Of course you are sorry you bought it, you bought an item for a VERY specific purpose and used it for something else.
I received a Yeti mug as a gift that I think would suit your purpose much better. It keeps liquid hot/warm for hours, and the lid prevents most spilling. It is taller than wider and fits in cup holders. Hope that helps!