DIY Travel Mug Lid

DIY Travel Mug Lid
How did I make this lid?

I lose lids off of travel mugs frequently. The great shame of travel mugs is the cheap caps that just fly off, into traffic, when biking. For a while I had been using lids from other disposable coffee cups. But then I found a lid to an empty peanut butter jar. So, pop quiz: how did I make this bad boy by spending no money on it?

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