Let's do a small thing to help our environment.
We buy milk each week. The warehouse store sell double one gallon milk in one box. I found this milk box can be made to a cardboard trash can and its size just fit most of grocery plastic bags. It reuse both the milk box and grocery plastic bags which we get a lot from supermarkets or grocery stores. Another benefit is you can change new trash can each week and it cost $0.
Step 1: Supplies
Grocery plastic bags (most of stores have similar size)