Pre-cuts such as individual fat quarters (approx size is 19" x 21"), fat quarter bundles, and individual cuts of half meters (approx size 19" by 42").
Grab-bags such as sample packs of a full collection of a designer's fabric, or mixed packs by colour of various designer fabrics. Sizes of fabrics in the packs can range from a charm square (5" square) up to a fat quarter, but the most common size in the packs are a fat eighth ( 9" x 21").
Pre-cuts and grab-bags are mainly used for things like quilting, zipper pouches or mask-making, where a large variety of small-sized pieces are desired. Also great for scrappy projects or EPP (English Paper Piecing).