50 Bags. The EtBr GREENBAG™ Disposal Kit allows rapid and trouble- free concentration of ethdium bromide from large volumes of solutions into a small "teabag" containing activated carbon. The GREENBAG is then conveniently disposed of along with other solid hazardous wastes. One kit has the capacity to remove 500 mg of ethidium bromide from solutions (10 mg EtBr/bag), enough to satisfy the requirements of most laboratories for a year.