Fabric > Bundles > Color Tone Fat quarter bundles are curated collections of fabric, often from a specific fabric line. We offer a large assortment of fat quarter bundles to get your next project started quickly and/or to give your quilting fabric stash a boost. Fat quarter bundles are perfect for building your stash for cheap, giving you a large selection of small but usable pieces of fabric. A fat quarter of regular quilting cotton fabric measures approximately 18'' x 21''.