store empty grocery bags- an empty cardboard fridge mate soda case that your sodas come in for storing empty plastic bags. The hole that dispenses the soda is used for both loading your plastic grocery bags and removing.
55 Clever Storage Ideas That Will Make You Super Happy (and organized!)
Recycle a wipes container into a portable plastic grocery bag container. Great idea for the car or beach bag. DIY tutorial on how to make it (including instructions on how to fold the plastic grocery bags) from Infarrantly Creative.