Hydro Flask 24 Oz Lightweight Trail Series Wide Flex Cap Tourmaline- Hiking Water Bottle

Why it's worth it

The 24 oz Trail Series uses thinner-gauge steel to cut weight, and the listing claims it's about 25 percent lighter than the standard 24 oz Wide Mouth. It's the entry point to the lineup and the one hikers should look at first.

Weight matters when it's on your back. Treeline Review's field testing of the Trail Series found it shaved several ounces off pack weight versus the standard Wide Mouth — not much on a grocery run, meaningful on a long day out. Hydro Flask says the Trail line cuts roughly 20 percent of the weight across the range, and this bottle lands at just under two-thirds of a pound empty. You feel that on a climb.

The insulation doesn't change with the thinner wall. It's the same TempShield double-wall vacuum construction, rated 24 hours cold and 12 hours hot on this listing. Owners in hot climates report ice surviving a full day in the sun. OutdoorGearLab's testing does note that standard-gauge Hydro Flasks edge out Trail Series bottles past 12 hours, so it's a small step down, not a different category.

From our review of 8 hydro flask bottles

What we like

• +Weight matters when it's on your back
• +The insulation doesn't change with the thinner wall
• +It ships with the Flex Cap and no straw, which suits how people use a trail bottle — grab, unscrew, drink, screw shut, keep…
• +The narrow body is the other quiet win

What to know

• –Thinner steel dents more easily
• –Twenty-four ounces isn't much for a long hike in heat
• –The lid is a Flex Cap, full stop