Tumbler Set of 3 ① Cainz Tumbler M with Lid, also usable in drink holders, 480ml 〈Full Capacity〉480ml 〈Material Type〉Body / Stainless Steel Lid / Polypropylene Packing / Silicone Rubber ② Double Tumbler - Design Beige MOCHA COFFEE 〈Material〉Body & Lid: Polypropylene Packing: Silicone Rubber 〈Heat Resistance/Cold Resistance Temperature〉Heat Resistance 100℃, Cold Resistance -20℃ 〈Product Size〉320ml ③ Double Tumbler - Design Black BYWORD FOR MILD COFFEE COLOMBIA 〈Material〉Body & Lid: Polypropylene Packing: Silicone Rubber 〈Heat Resistance/Cold Resistance Temperature〉Heat Resistance 100℃, Cold Resistance -20℃ 〈Product Size〉320ml I purchased these but never used them, and they have been stored at home. How about using them at the office, camping, BBQ, or other outdoor activities?