the average person uses 500 to 550 plastic bags a year so if you go on Amazon it costs $18.82 to get 104 bags so that would be a total of $94 $95 a year based off that step or you can get 20 reusable bags in various sizes that total $20 so that means in one year you've saved $75 and over the span of5 years you could save close to $450 to $500.