They were plastic. They used to hold water. I've never seen those in glass. Moving them you had to pull it little sideways and roll it on the bottom edge.
Back in the day, those water cooler jugs (carboys) were made of glass but for many years now they have been made of plastic. The glass ones are coveted by homebrewers because they don't scratch and harbor bacteria. Sorry for the OT tangent, I've got a few in the basement I got from the local bottled water outfit about 25 years ago.
Growing up, my family saved change in one of these. About two weeks before our annual vacation to six flags and the Saint Louis zoo we would roll the accumulated change. It always paid for our gas, sometimes even a ticket or two!
I meant to post some photos to this thread, but it's taken until now for me to dig out the things I wanted to show. Separate posts coming, as the photos are on my phone, but I'm typing on my laptop.
This bank came out of a tin stored in the wall of a friend's father's house. I sold a bunch of silver for her at a show (mostly 40% Kennedys), back when silver was in the $25 range; I kept this, and paid her the going rate, so I guess that counts as a good buy. I counted up $6 FV of silver Washingtons (and two clad), and $6.50 worth of silver dimes. No key dates, and I think nothing notable in the nickels or cents. The "key" eventually turned up in the bottom of the tin, but I'd already opened the thing with a screwdriver. It's not much of a lock.
Every year, Mom's parents would give each grandchild $25 on their birthday. I think this was the last time they did that. When I was very young, it was quarters; in the early 70s, it was Ikes. In 1979, it was SBAs, all 1979-P. But either they couldn't get 25 of them, or they wouldn't fit in the mousey bank, so this was 20 dollars and 50 1972-P dimes, all either AU or uncirculated. A few show fingerprints now; not sure if they're mine, my grandparents', or someone else's. In any event, I'm glad I misplaced this before I could spend the money. By market value, I'm way behind, but by sentimental value, I'm way ahead.
And finally, when I started college in the fall of 1980, cents were already of completely trivial value. I started putting them into a Tech Beer bottle - terrible beer, but it was Virginia Tech, so of course everybody had to have at least one bottle. I think I taped this off in mid-1982, so there probably aren't any Zincolns, but lots of 1982s. I'm guessing maybe 300-400 or so coins? Lots of full luster, and I guess not much air got through the tape. I do feel bad for that 1969-D that was on top, but it protected all the rest.