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Insulated Water Bottle, Stainless Steel Vacuum Cup with Handle, Thermos Flask, Double Walled Sports Travel Mug with Leak Proof Lid, Keep Hot and Cold, 12 Hours BPA Free, 15 oz, Black :
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Amazon.com: Stainless Steel Thermos Cup, SUPKIT 12oz Small Thermos Vacuum Cup, BPA Free, Insulated Water Bottle Keep Hot & Cold for Hours, Perfect for Biking, Camping, Office, Car or Outdoor Travel (Taro
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My thermos flask worked fine for a few months until it suddenly stopped keeping the heat in entirely. How do vacuum flasks stop working? - Quora
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