- Perishable foods without proper cooling (dairy, meat) or they need to be kept hot in insulated thermos (like meat, rice) in order to avoid food safety risks. These should not stay at room temperature for more than two hours. - Messy or sticky items (syrups, overly saucy dishes), for this use special containers. - Hard-to-eat foods (whole nuts, tricky packaging). - Strong-smelling foods (pungent). - Sugary snacks (candy, soda) affecting focus and energy later. - Foods that get soggy or fall apart easily (delicate pastries or overripe mushy fruits). - Allergy-risk items (nuts in allergy-restricted areas). - Overly processed snacks (chips, sugary granola bars).