The 6 piece Progressive ProKeeper set containers feature a silicone seal for airtight storage. The removable levelers snap into the lid for easy storage. Measurement marks clearly display remaining volume. Set includes one of each Flour, Granulated Sugar, Brown Sugar, Powdered Sugar, and 2 mini ProKeepers.For over 40 years, our mission has been to create innovative kitchen tools and gadgets that make food preparation fun and fast while inspiring culinary creativity. From our thinstore collapsible to our sophisticated PL8 line, our dedication to providing quality products supported by superior customer service continues to drive our creative development today. At Progressive International, we continually strive to understand the needs of today's cooks. Our team includes talented, energetic and passionate people committed to reimagining the kitchen. We strive to pass our passion on to our consumers through our thoughtfully designed tools, layered with our avid desire to go beyond the exp