The flexibility in the hours you work is one of the best benefits but all other benefits pale with respect to other packaging companies of similar or larger size.
Best part of working in Sonoco is the people and true flexibility of work hours instead of the typical 8-5. Many people work from home. The benefits are however average. The health insurance is either 70/30 or 80/20. 401K matching is 4% I believe. The premiums are quite high and there are NO other substantially appreciated benefits such as health club memberships, onsite medical personnel, child care assistance, bonuses, or onsite breakfast/lunches. Also the typical 2 weeks of time off is subpar compared to what other company's offer these days.
List based on reports from current and former employees. It may not be complete.