That comes in handy. ✬

This is a handy little box. ✬

Take this folding umbrella with you. It might come in handy. ✬

Always keep this dictionary handy. ✬

She's very handy with a saw. ✬

A gun might come in handy. ✬

Having a small flashlight in your pocket may come in handy. ✬

Here. Take this with you. It might come in handy. ✬

I can think of some situations in which a knife would come in handy. ✬

I never thought this rubber band would come in handy when I put it in my pocket this morning. ✬