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Pumpkin and arrowroot starch instant porridge is a food product that is convenient to serve and appetizing to the panelist. Pumpkin and arrowroot starch instant porridge is a dry product that contains sugar; therefore, it is sensitive to moisture change during storage. Developing further product requires investigation on the proper storage condition and product stability during shelf life. Therefore, it is important to evaluate the different pattern s of moisture absorption during storage. Moisture sorption isotherm of pumpkin and arrowroot starch-based instant porridge was determined using static gravimetric method at 25°C. The sample was reserved in a room RH controlled by different types of water activity (aw) from 0.07 to 0.97 to reach a balance water content. Moisture absorption was fitted to the GAB model (Guggenheim-Anderson-de Boer). The permeability of the 0.08 mm polypropylene plastic container and the shelf life of pumpkin and arrowroot starch-based instant porridge were investigated according to treatment with an accelerated technique. The result showed that the moisture sorption isotherm of pumpkin and arrowroot starch-based instant porridge showed a sigmoid curve. The shelf life of pumpkin and arrowroot starch-based instant porridge that was packed in 0.08 mm polypropylene plastic containers at 70% RH was 178.60 days or 5.96 months. [ABSTRACT FROM AUTHOR]