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Most of this collection is one thing done several ways: a double-wall vacuum flask in stainless steel, which keeps hot drinks hot and cold drinks cold because there is no air between the walls to carry heat. The Hold My Temperature Stainless Steel Thermos, the Stainless Steel Heavy Duty Travel Hiking Thermos and the Travel-Ready Double Wall Sport Thermos are the plain version of that idea. Everything else in the grid is a variation on the lid, the size or the job.

The smart lids are the biggest variation. A Smart Temperature Display Vacuum Thermos, an LED Temperature Display Smart Thermos Coffee Mug and a Funky LED Temperature Display Thermal Water Bottle show the drink temperature on the cap, which is genuinely handy for anyone who has burned their mouth on coffee at a desk. Know what you are buying though: that display runs on a battery inside the lid, it is the part most likely to stop working first, and lids are rarely sold separately. The Fingerprint Lock Smart Temperature Display Kids Water Bottle adds a lock, which solves a school problem and adds one more thing to charge. Heated models like the Stainless Steel Portable Electric Heating Thermos and the Smart Digital Adjustable Temperature Travel Heating Thermos need power, so check whether it wants USB or a car socket before you buy it for a commute.

Leaks and cleaning are what people actually complain about, not insulation. Straw lids and gasket lids are where it starts, so look for the reviews that mention a bag getting wet. Pull the silicone seal out of the lid when you wash it, because that groove is where smells live, and use a bottle brush on anything with a narrow neck like the Easy Lock Leakless Water Bottle or the Stainless Steel Built-in Straw Camping Thermos. Vacuum bottles generally do better hand washed; dishwasher heat can wreck the seal and dull the outside finish, and some listings void the warranty over it.

The specialist bottles solve narrower problems. The Reusable Foldable Flexible Water Bottle packs flat when empty, which is the whole point, though a soft bottle cannot insulate. A Large Water Bottle with Filter suits travel and hiking, and the filter is a consumable, so check that replacements exist before you commit. The Tea Maker Large Capacity Thermos and the Stainless Steel Tea Maker Digital Temperature Thermos have infuser baskets for loose leaf. Workout Running Spray Water Bottles and the Creative Cool Summer Spraying Bottle Water add a mist nozzle for hot days, and the Portable Instant Smoothie Cup Juice Maker is a blender you drink from.

One group here is doing a different job entirely. The Portable Pet Dog Water Bottle Dispenser for Traveling and Walking, the Sip & Stroll Portable Pet Water Drinking Bottle and the Portable Travel Pet Bottle Water Feeder pour into an attached trough so a dog can drink one-handed on a walk, and any surplus tips back into the bottle. Worth knowing before you order what looks like a bottle for yourself. On capacity, be honest about the carry: a big steel flask filled with water is heavy in a bag all day, and the size people regret is usually the largest one. Every bottle shows its rating and review count, which is where the leak complaints surface. Shipping is free, and most orders are on their way within a day.