Why doesn an Envirosax have a gusset (square bottom)?
A bag made from nylon or polyester will not stand up on its own. A nylon or polyester bag packed correctly full of groceries propped up against another bag, will stand up on its own, with or without a gusset. A rigid polypropylene bag will stand up on its own but cannot be rolled into a small package like an Envirosax and stored in a pocket or glove box of a car, and as such you will find people everywhere who own lots of them but keep forgetting to take them to the store with them. A reusable bag is only having a positive impact on the environment if you are actually reusing it. If an Envirosax is packed correctly with square and rectangular items at the bottom of the bag, and irregular shaped items at the top, the bag will have no problem staying upright in the boot of the car or on your doorstep. Comparisons between Envirosax and other reusable bags often note that the compact designs means that they are easier to keep in your purse and thus are more likely to be reused, which is th