It’s always been a confusing aspect of airline and airport security: when you’re going through TSA checkpoints, what actually constitutes a banned liquid?

A peanut butter and jelly sandwich? A pecan pie?

We all know that a can of soda or bottle of water can’t go through security. Large bottles of cologne or moisturizer are also banned.

But there are exceptions to the 3-1-1 rule, which means no containers larger than 3.4 ounces. Over-the-counter liquid medications are allowed, along with contact lens solution, ice packs to keep medications cold, fish transported in water, and breast milk. As for the peanut butter and jelly sandwich and the pecan pie, they should be fine.