The size you need depends on the size of your household and how much you recycle. Many single persons or couples that recycle just need the small 48-gallon container. A family of four or more probably needs the large 95-gallon container.
A great way to tell is to check your current trash can when you take it to the street. If it’s usually only half or three-quarters full, you’ll know a smaller can is right for you. If it’s always full to the brim, you should probably keep the larger 95-gallon can.
In general, the 95-gallon easily holds five 13-gallon tall kitchen bags; 65-gallon, four bags; and the 48-gallon, three bags.