Based on what you write, you very well may have a case against the milk company and also this individual worker. Trying to bring in 10 crates each weighing around 20 lbs--so around 200 lbs in total--at once is negligent or careless; that makes the employee liable. The employer would be liable because an employer is responsible, under the theory of "respondeat superior" (you can remember it as, "let the superior respond," or "let the employer answer for what as done") which makes employers responsible for injuries caused by the careless acts of their employees committed during work. While you cannot receive "double compenstion," so you can't get from them anything (e.g. medical costs) you are already receiving from somewhere else (like insurance), you can sue them for anything (like lost wages) you're not otherwise being paid. (As an aside: 1 liquid oz. weighs 1 oz., more or less, so 50 6-ounce bottles is 300 ounces; at 16 oz. to a pound, that's 18.75 pounds per crate, plus the weight of bottles and crate, so around 20 lbs per crate.)