Used 2 of the cubes daily, gives me plenty of space in my backpack  for other items I bring with me. The small one I can fit 2 pairs of underwear/ 2 pairs of socks. The medium one I can fit 4 pairs of tshirts/ or 2 pairs of tshirts/ one  set of  scrubs. These cubes are ideal for packing for a long vacation and giving you plenty of space in your luggage