Quality PET jars with lined child resistant closures are the best way to package cannabis. These flower jars are thick wall and rugged and will perform well for your most valuable products. 2oz (2 fl oz) holds 2 grams -- 20 dram (75ml) holds 1/8 oz of dense buds -- 30 dram (100 ml) holds 1/8 oz -- 40 dram(4 oz - 120 ml) holds 1/8 oz of larger buds or 1/4 oz of dense buds -- The quantity of flower these jars can hold is dependent on bud size and density. Please be sure to check these capacities with your buds.