

The GSI Microlite 720 Flip, while leakproof, had a rather confusing lock mechanism, and the lid required me to actively pull it open instead of automatically popping open once unlocked, which I expected. I preferred water bottles that were easy to use in terms of lids and locking mechanisms, like the Hydro Flask, which had the simplest lid design of them all: it featured a screw-on lid with a straw mouthpiece that lifts up-easy peasy. Durability Test: I dropped each water bottle five times onto a gravel driveway to examine durability.Īn Intuitive Lid with a Smaller Sipping Opening Was Best.I also ran the dishwasher-safe bottles and parts through the dishwasher, checking for any damage afterwards. Cleanup Tests: I hand washed each water bottle with a bottle brush and soapy water, noting how easy or difficult it was to do so.Cold Retention Test: I filled each water bottle with 100 grams of ice and 300 grams of chilled water and checked the temperature with an instant-read thermometer every hour for 24-plus hours.Spill Test: I filled each water bottle with water and knocked it over five times onto a surface lined with paper towels, noting if it leaked.

I also evaluated how easy they were to fill with water and ice cubes.

Usability Tests: I sipped water from each water bottle at least 25 times, using each throughout the day and bringing them with me to the gym.Water bottles with too-small openings were no-gos: they proved too hard to fill with ice.
