This modular storage rack for a chest freezer provides a flexible and low cost solution for organizing sample storage. Individual racks click together to form a tower of up to 15 holders. One rack holder has a capacity of a single Roborack-96, Comorack-96 or any of the ULT Racks. When using the Loborack-96 with a low cover / Micronic 96-1 Rack, one rack holder fits two Loboracks, providing a space saving storage solution. This is an easy to use light-weight modular storage system.