{"product_id":"rivers-stem-vacuum-flask","title":"Rivers STEM Vacuum Flask","description":"\u003cp class=\"product-lead\"\u003eThe Rivers STEM is a 500 ml stainless steel vacuum flask designed for daily commutes and outdoor use, keeping beverages hot for up to 6 hours at 73°C \/ 163°F or cold for up to 6 hours at 7°C \/ 44.6°F. It is available in three colors (Ash Blue, Sandstone, and Black) and in two configurations: a standard model and a Bottle Leash model with an attached carrying strap.\u003c\/p\u003e\n\n\u003ch2\u003eBuilt for the Commute and the Trail\u003c\/h2\u003e\n\u003cp\u003eThe STEM flask's stainless steel body is vacuum-insulated to hold temperature across a full six-hour window, whether that's a morning of back-to-back meetings or a half-day hike. At 230 g \/ 8.11 oz and 225 mm tall, it sits in a standard bag side pocket without adding meaningful weight to a daily carry.\u003c\/p\u003e\n\n\u003ch2\u003eElectropolished Interior, Spill-Proof Lid\u003c\/h2\u003e\n\u003cp\u003eThe interior is electropolished to create a smooth, gleaming surface that resists odor buildup and makes residue easier to rinse away. The lid and plug use polypropylene and silicone rubber to form a spill-proof seal, so the flask can ride in a bag without a protective sleeve or secondary bag.\u003c\/p\u003e\n\n\u003ch2\u003eBottle Leash Option\u003c\/h2\u003e\n\u003cp\u003eThe Bottle Leash configuration adds a polypropylene hook-and-Velcro strap that clips to a pack or serves as a carry handle. The leash is integrated into the Bottle Leash model's design and cannot be added to a standard STEM after purchase. Choose the configuration at the time of ordering.\u003c\/p\u003e\n\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVacuum insulation:\u003c\/strong\u003e maintains hot beverages at 73°C \/ 163°F and cold at 7°C \/ 44.6°F for up to 6 hours\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectropolished interior:\u003c\/strong\u003e smooth stainless steel surface resists odor and simplifies cleaning\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpill-proof lid:\u003c\/strong\u003e polypropylene and silicone rubber construction seals securely for bag carry\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBottle Leash option:\u003c\/strong\u003e integrated hook-and-strap system for attaching to a pack or carrying by hand\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eDesigned in Japan, made in China\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eSpecification\u003c\/th\u003e\n      \u003cth\u003eDetail\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCapacity\u003c\/td\u003e\n      \u003ctd\u003e500 ml \/ 16.9 oz\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eDimensions\u003c\/td\u003e\n      \u003ctd\u003eW 80 mm x D 70 mm x H 225 mm (W 3.14\" x D 2.75\" x H 8.85\")\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eWeight\u003c\/td\u003e\n      \u003ctd\u003e230 g \/ 8.11 oz\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eHot insulation\u003c\/td\u003e\n      \u003ctd\u003e73°C \/ 163°F for 6 hours\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCold insulation\u003c\/td\u003e\n      \u003ctd\u003e7°C \/ 44.6°F for 6 hours\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBody material\u003c\/td\u003e\n      \u003ctd\u003eStainless steel (electropolished interior)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eLid and plug materials\u003c\/td\u003e\n      \u003ctd\u003ePolypropylene, silicone rubber\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eRing material\u003c\/td\u003e\n      \u003ctd\u003eStainless steel\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eLeash and hook materials\u003c\/td\u003e\n      \u003ctd\u003ePolypropylene, polyester (Velcro and tag), Bottle Leash model only\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eColors available\u003c\/td\u003e\n      \u003ctd\u003eAsh Blue, Sandstone, Black\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eNot suitable for\u003c\/td\u003e\n      \u003ctd\u003eMicrowave, dishwasher, dryer; keep away from direct flame and heat sources\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOrigin\u003c\/td\u003e\n      \u003ctd\u003eDesigned in Japan, made in China\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWho This Is For and Isn't\u003c\/h2\u003e\n\u003cp class=\"product-fit-yes\"\u003eThe Rivers STEM suits commuters, hikers, and anyone who wants a compact, spill-resistant flask for hot or cold drinks across a half-day outing. The Bottle Leash model is a good fit for those who carry a backpack and want the flask accessible without opening a pocket.\u003c\/p\u003e\n\u003cp class=\"product-fit-no\"\u003eThe STEM holds 500 ml, which is not suited to situations requiring larger-volume hydration. It is not dishwasher-safe, microwave-safe, or dryer-safe, and should not be used near direct flame or heat sources. The Bottle Leash is built into the Bottle Leash model only; the two configurations are not interchangeable.\u003c\/p\u003e\n\n\u003ch2\u003eCommon Questions\u003c\/h2\u003e\n\u003ch3 class=\"product-faq-q\"\u003eHow long does the Rivers STEM keep drinks hot or cold?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eThe Rivers STEM vacuum flask maintains hot beverages at 73°C \/ 163°F for up to 6 hours and cold beverages at 7°C \/ 44.6°F for up to 6 hours under standard conditions.\u003c\/p\u003e\n\u003ch3 class=\"product-faq-q\"\u003eWhat is the capacity of the STEM flask?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eThe Rivers STEM holds 500 ml \/ 16.9 oz, making it a single-serving flask suited to a commute or a half-day outdoor activity.\u003c\/p\u003e\n\u003ch3 class=\"product-faq-q\"\u003eWhat is the difference between the standard and Bottle Leash models?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eThe Bottle Leash model includes an integrated polypropylene hook-and-Velcro strap for clipping the flask to a bag or carrying it by hand. The standard model does not include this strap, and the leash cannot be added to a standard STEM after purchase.\u003c\/p\u003e\n\u003ch3 class=\"product-faq-q\"\u003eCan the Rivers STEM go in the dishwasher or microwave?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eThe Rivers STEM is not suitable for the dishwasher, microwave, or dryer. Hand washing with water and soap, followed by air-drying or wiping dry, is recommended. The flask should also be kept away from direct flame and heat sources such as gas stoves and ovens.\u003c\/p\u003e\n\u003ch3 class=\"product-faq-q\"\u003eHow should the STEM flask be cleaned?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eThe Rivers STEM's electropolished stainless steel interior resists odor and residue buildup. Hand wash with water and soap, then air-dry or wipe dry. Do not use abrasive cleaners, and do not place in a dishwasher or dryer.\u003c\/p\u003e","brand":"Rivers","offers":[{"title":"Ash Blue \/ With Leash","offer_id":68211140559069,"sku":"SPS-RI\/STM\/BL+L","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Ash Blue \/ Without Leash","offer_id":68211140591837,"sku":"SPS-RI\/STM\/BL","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Sandstone \/ With Leash","offer_id":68211140624605,"sku":"SPS-RI\/STM\/TN+L","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Sandstone \/ Without Leash","offer_id":68211140657373,"sku":"SPS-RI\/STM\/TN","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ With Leash","offer_id":68211140690141,"sku":"SPS-RI\/STM\/BK+L","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ Without Leash","offer_id":68211140722909,"sku":"SPS-RI\/STM\/BK","price":50.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0614\/3315\/1709\/files\/stemBlueLeash-sq.jpg?v=1792209521","url":"https:\/\/coffeeroastco.com\/ja\/products\/rivers-stem-vacuum-flask","provider":"CoffeeRoast Co.","version":"1.0","type":"link"}