The PPM Instrument Carrying Case (Part # OLCASE) holds three Acrulogs/OdaLogs for storage and transport purposes. The case is made of ultra high impact polypropylene and is waterproof and airtight. Outside dimensions are 10 5/8″ x 9 3/4″ x 4 7/8″. Inside dimensions are 9 3/8″ x 7 5/16″ x 4 1/8″.