That's what we did in elementary school last time it happened in our area years ago. I believe we used a shoe box, took off the lid, poked a pin hole on one side and viewed it.

Here's a link to it's construction.

https://www.livescience.com/33906-solar-eclipse-viewer.html

I'd say the box the glasses come in from Amazon is probably more useful than the glasses in many cases. :)