How is a plastic bag measured?
To measure a plastic bag, lay it flat. The width is the first number, then the height. If the bag has a gusset (a fold on the sides or bottom) lay it completely flat and measure the gusset all the way across. For example, if your bag is 15″ wide and 18″ tall, it is a 15 x 18 bag. If your bag has a side gusset of 4″, your bag would be a 15 x 4 x 18. If your bag has a bottom gusset of 4″, your bag would be a 15 x 18 +4.
