A portable temperature-controlled container for receiving and housing one or more handheld carriers, each handheld carrier configured to transfer samples to and from a temperature-controlled storage environment, the handheld carrier including a handle and a tray portion, the tray portion configured to be slid into a port of a rack or tower provided in the temperature-controlled storage environment in order to withdraw a sample located in the port, the portable temperature-controlled container including a housing having an opening forming an internal cavity configured to receive one or more handheld carriers, and a lid configured to substantially close the opening, where the housing includes a recess configured to receive the handle of the handheld carrier such that closing of the lid substantially seals the internal cavity when the one or more handheld carriers are placed in the housing.