Premium, heat sealable, FDA/USDA approved poly bags are excellent for keeping your product clean and protected from moisture during shipping and/or storage. The 100% virgin resin used to manufacture these bags offers moderate strength and clarity. Dimension clarification: The first number is the flat width. The second number is the "gusset", or the measurement of the plastic that goes in and out on one side. The third number is the bag length Not sure which product will work best for your needs? Free samples are available upon request.