Abstract: A sample organizer that will retain a number of fluid samples such as blood samples, for example, wherein each such sample is contained in an individual plastic collection tube. The plastic collection tubes fit into horizontally defined apertures which allow the tubes to be inserted without undue force. The apertures are specifically designed to allow secure insertion and retention of blood samples, for example, without promoting hemolysis. The fluted carriage design also prevents the sample collection tubes from spontaneous dislodgment. Sample organizers may be "stacked" or nested due to the lightweight frame design and further, provide for fluid sample identification such as number, name, source, verification, etc.