How can I keep the Apple pencil holder in the case?

The Apple Pen holder works by inserting into the case and then sliding up to lock in. But whenever I put it in a bag, the holder slides right out, Pen and all. Is there a way to get the holder to stick to the case?

Tech21 Impact Clear Case for 12.9-inch iPad Pro (2nd Generation)

Tech21 Impact Clear Case for 12.9-inch iPad Pro (2nd Generation)

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