What's a good snack/meal that I can eat in lecture halls without being insecure about noise or smell? Last semester was the first semester I wanted to take my lifting seriously, but I wasn't eating too well because I had to sit to 3-4 hours straight of morning-noon lectures with no breaks. I tried to bring my prepped meals consisting of rice + protein but I felt insecure about chewing it and using utensils in class, etc. Due to unrelated events, I haven't gone to the gym in the last month and gained a bit of fat so I plan to get back and cut within a month or two after recovery. 

My classes will run 4-6h straight this semester with no breaks. What's the best foods can I prep and eat or snack on during that? Right now all I can think of is a chicken wrap (+ nuts on my way to classes).