http://www.packagingsuppliesbymail.com/Ziplock-Bags-w-White-Block/ - Call us @ toll free no. 1-800-456-2467 The Ziplock white Block Bags is another variety of the bags which serves excellent for investigative needs, food storage (flour, meat, fruits, veggies), general supply and more. The white block is the label which can specify storage details like contents, dates, names even when optimal view is clear.