Basic letter size manila folders are the building blocks of your filing system. On Time Supplies offers GSA rates and discount bulk pricing on letter size manila folders in a range of styles -- and from the top file folder brands. Plus, thanks to our rush delivery and local pickup options, you can rely on us to deliver your letter size manila folders in just 1-2 business days. Questions about the letter size manila folders for sale at On Time Supplies? Contact us toll free at 1-866-501-6055. Our friendly customer service representatives are happy to answer any supply questions.