This is Otsuka Pharmaceutical's oral rehydration solution OS-1 (OS One) powder type. It includes 5 unopened boxes of 500mL x 10 packets each, plus 2 loose packets, for a total of 52 packets. [Product Contents] ・OS-1 Powder Type (15g x 10 packets) ・Expiration Dates: May to July 2026 (Please check the photos as they vary.) ・Stored at home in a cool, dark place [Features] OS-1 powder is a rare type that is not often found in stores, and it can be stored lightly and compactly. It's a reliable preparation for the upcoming season's influenza and infectious disease prevention, as well as for fever and dehydration. You can make an oral rehydration solution anytime by simply dissolving it in water, making it ideal for **emergency stockpiling and summer heatstroke prevention**. [Notes] ・Unopened and unused, but please refrain from purchasing if you are sensitive to items stored at home. ・Some stains may be visible on the outer boxes due to aging, but there are no issues with the product itself. Thank you.