They all can hold your favorite beverage. What really sets them apart, though, is how they perform when the temperature drops.
Nalgene: Made of durable polycarbonate, which one study links to genetic damage in mice. The bottles come in many sizes, colors. Shown: 0.35-, 0.75-, 1-liter capacity. Weight: 3.3, 6, 6.2 ounces. $6.40, $10, $10. (800) 625-4327, nalgene-outdoor.com. (Eric Boyd / LAT)
Platypus: Durable nylon layer over food-grade polyethylene liner. Passes freezer test. Clear only, four sizes; shown are 0.5-, 1-, 2.4-liter bottles. Flyweight at 0.8, 0.9, 1 ounce. $4.50, $5, $7. Superb value. (800) 531-9531, platypushydration.com. (Eric Boyd / LAT)
SIGG: Lined aluminum. Insulating pouch needed to prevent rupture when contents freeze. Many sizes, colors. Shown: 0.6-, 0.75-, 1-liter bottles. Weight: 4.6, 4.5, 5.1 ounces. $22, $20, $16. (800) 253-3974, siggswitzerlandusa.com. (Eric Boyd / LAT)