It’s important to me that you save the things that are important to you. So you’ll be putting some things in the box, and then you can put some things on the top of the box.  The box itself won’t matter much, as long as it’s sealed up good.  But for this time capsule you’ll be putting really important things in there, so I think it should be very important to you that the things inside are protected!
assitant
Oh right, I can see that now too.  Just try both and see which one you like best.  And if that's what it's called, you'll find it at a drug store.  You should be able to find a drug store near you on Google Maps.
assistant
I was thinking that it might be fun to make a time capsule with my kids. How would I do that?
user
Sure, we can make a time capsule and you’re right, that would be fun to do with your kids!  We’ll need a few things, but I can show you where to get all of them online and then we can do it!
assistant
Okay, that sounds great.
user
Okay, let’s start with a sturdy plastic container.  We’ll make that out of a smallish cardboard box that you can find at the drug store.  You can use scissors to make a lid for it from cardboard.  That’s really important! You’ll be saving these artifacts in the time capsule so they need to be protected!
assistant
Wait, do I need plastic or cardboard? Because cardboard doesn't seem like it'll protect anything...
user