I was looking for glass storage containers that didn't cost the earth. This fits the bill nicely. They seem sturdy and the box says its oven safe. I hope to be able to keep these for a number of years.  

Pros: Strong, sturdy, airtight, oven safe, hygienic 
Cons: The rubber seal came off when I first opened them on 2 of them, but its not a big deal. I just popped them right back and they seem just fine, airtight.