I got a bunch of wheaties a while back from the bank (a mini hoard of 33 rolls, all wheats). I sorted them into year groupings (usually 2 -3 years) in plastic cups. I will look for errors later, but wanted to put them in something while keeping them sorted. My wife gave me a number of those ziplock storage containers (like cheap tupperware). I'm guessing that this is not a good place for them due to the plastic (how do you tell if there is pvc in it?). Anyone have suggestions? Several of these 8 oz cups are filled to the rim....I just need something to store and lable it for now.... Thanks.