Abstract: A data logger system is disclosed. Specific implementations include a flexible data logger system. The data logger system may include a flexible substrate and a radio-frequency identification (RFID) communications module coupled to the flexible substrate. The RFID communications module may include an antenna coupled with a RFID chip. The data logger system may also include a microprocessor and a memory module coupled to the flexible substrate, the microprocessor and the memory module electrically coupled with the RFID communications module. The data logger system may also include a temperature sensor coupled to the flexible substrate, the temperature sensor electrically coupled with the microprocessor and memory module, and a power source coupled to the flexible substrate, the power source electrically coupled with the microprocessor, the memory module, the temperature sensor, and the RFID communications module.