The mason jar has been around for more than 150 years. So, why has it now become one of the most popular social media subjects, with thousands of posts popping up on Pinterest, Instagram and Facebook? It seems like the nostalgia of an older generation has returned and thrust this seemingly simple container into the spotlight. What was once used only as a way to preserve jams, pickles and fresh vegetables are now used as drinking vessels, gift packaging and lunch boxes. Create your own personalised jam jar mugs with Zazzle today.