We purchased the sensor garbage can and tried the standard grocery store 13 gal trash can liners and they worked. I then tried the SimpleHuman sample pack of lines that came with the trash can and quickly realized that they were so much better ... fit precisley and are a much thicker bag. I am now sold and will not go back to the other bags. They are well worth the price (not that much more) and store within the trash can. Great product.