You cannot store items that are illegal, stolen or environmentally dangerous.
Flammable, corrosive or explosive items including: acid, aerosol cans, ammonia, ammunition, anti-freeze, asphalt shingles, batteries (car or household), charcoal, chemistry sets, cleaning fluids, fertilizer, fireworks, foamed rubber or foamed plastic, gasoline, kerosene or lamp oil, lacquers, lighter fluid, linoleum products, liquid bleach, loaded weapons, lubricating or hydraulic fluid, matches or lighters, motor oil, nail polish and remover, paints and paint thinners, pesticides or weed killers, poisons, pool or spa chemicals, propane tanks and rubber tires.
Perishables such as food and plants including: alcoholic beverages, any type of grain or legume, bird seed, cat food, dog food, or any other pet food or live animals, biscuit or cake mixes, cereal, flour, pharmaceuticals, potpourri made with dried petals and spices, rice, spices, sugar, vegetable oil and butter in plastic containers.
Christmas and holiday decorations made of food including: bread dough ornaments, popcorn strings, and wreaths garnished with candy, nuts, or fruits.