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But the press-in lid doesn’t create a tight enough seal to prevent leakage when the cup is knocked over. Though the tumbler and lid are both dishwasher-safe, the one-piece lid has crannies where grime and gunk can build up. The lid screws into the mouth of the tumbler, and the flip straw folds closed, to create an airtight seal that keeps liquid from seeping out. No straw lid can be completely leakproof, but this quarter-turn lid comes close. And the flip-top and straw lids both have removable rubber gaskets, which you can pop out to do a deeper cleaning. And Glassware on the other lid is made of a flexible, soft plastic, so it’s nicer to sip from than harder plastic or metal straws. Those designed for cold drinks boast straws, while those for hot beverages have small spouts for sipping. (It's actually one of the only 40-ounce tumblers I tested that's leak-proof.) It didn't leak in our drop test, where we drop the tumbler from a height of three feet, but it did dent. It combines the leakproof qualities of a water bottle, the easy-access straw of a tumbler, and the insulating power of a travel mug. In our testing, this model was the best at retaining heat, but if you’d like to enjoy the occasional cup of coffee or hot cocoa, you’ll have to buy a separate slider lid. Like our top pick’s lid, the Everyday Tumbler’s lid screws into the mouth of the cup, creating a watertight seal that doesn’t leak when you knock the tumbler over. The Simple Modern tumbler, the lids, and the plastic straw are all dishwasher-safe. If our top pick is unavailable, and you prefer drinking from a straw, we recommend the 20-ounce RTIC Everyday Tumbler. It has a contoured body, so it’s simple to hold, and the handle makes it easy to carry around. This tumbler is easy to sip from and operate while you’re driving. Handles make for easier carrying by hand, but might not allow you to carry your tumbler in a backpack pocket or car cupholder, depending on the tumbler. In addition to Lab tests, we send tumblers to consumer testers to get their opinions on how they fare in real life. Using either a dishwasher or dish soap and a brush, we test how easy it is to clean each model. We then remove a specific amount of water from each tumbler, replacing it with a calculated amount of ice. In the Good Housekeeping Institute Kitchen Appliances and Innovation Lab, we evaluate each piece of drinkware for leakage, temperature retention, durability and more. Keep in mind that if you accidentally drop this tumbler, the MagSlider may fall off (it did in a drop test) and spill your beverage, so be careful when transporting. They both count themselves as avid coffee drinkers, serious hydration fanatics, tea lovers, and enjoyers of fine cocktails. If you want the security of a locking lid but prefer the option of keeping it open, a flip lid model like the MiiR Flip Traveler might suit you better. The insulation of the West Loop is so good that when we put near-boiling tea inside, we couldn't drink it for hours, so getting the temperature right to enjoy your beverage during your commute is key. The RTIC is best for those who want a great insulative mug that fits easily in any cupholder at a great price. This model was particularly easy to know over, with a high center of gravity and poor spill resistance. The Bubba Brands Envy has no seal around its straw, instead relying on its tall, thin, and slanted design to help resist splashing. This helps stop slopping during transit but doesn't stop liquid from leaking out when tipped fully on their sides. We found that after long amounts of time spent on its side, the RTIC would eventually allow small drops to squeeze their way through the lid seal. The 16-ounce size is just right for a hefty cup of coffee with room for a little cream or even froth. I own the 20-ounce version of this tumbler, but it’s also available in a 28-ounce size as well, both of which have slim designs. Plus, it’s the only tumbler on this list to have a ceramic lining, so you don’t get that metallic-y taste that can sometimes come with stainless steel. Although this tumbler is only available with a straw lid, it has a surprisingly tight seal. In this metric, we pooled all the rest of the small details that can make or break your tumbler-using experience. Both the Fellow Carter and the Coleman Brew carry a “not dishwasher safe” rating from their manufacturers, while the RTIC has no recommendation as to how best to clean it. The Yeti Rambler, Camelbak Horizon, Bubba Brands Envy, Hitslam Wine, and Tronco Glass are all rated fully dishwasher safe by their respective manufacturers. The Bubba Brands Envy's straw is exceptionally long, which may be harder to clean with a standard straw brush. Cleaning the nooks and crannies of the lid is also tricky, and when the flip-top is sealed, attaching the lid completely to the tumbler can be difficult. It is also important to note that camp chairs have a wide variance in cupholder sizes, meaning this tumbler might fit just fine in others. You can open or close the straw by turning the lid, the idea being that you can turn it upside down without any liquid escaping from the straw. Plus, it’s available in numerous colors and has a convertible lid that can be used to drink two different ways. Our review team spent months drinking hot and cold beverages from each insulating cup while evaluating performance in real-world and controlled tests. A self-proclaimed tumbler hoarder, Melanie pulled together all 27 of her tumblers and tested them head to head, evaluating each on their design, temperature retention, durability, and more. Many of the tumblers on this list are dishwasher safe (although Owala recommends you hand-wash the cup portion to protect the longevity of the coating). These offer the best temperature retention for both hot and cold drinks.