Stay hydrated with our favorite water bottle. It keeps cold drinks frigid and hot drinks toasty for 12 hours, plus it comes with a strainer for your tea leaves. $26.95; ecovessel.com
MAKER SPOTLIGHT: Discover how EcoVessel based in Boulder, Colo., got its start.
Squeeze Water Filter
Weighing just 3 oz., the Squeeze Water Filter ensures you have access to clean water during any hike. Fill up your pouch at a lake, stream, or river, screw the filter onto the pouch and squeeze the bag to filter water into a bottle. $34.95; sawyer.com
Yellowstone Firebird Tee
Celebrate Yellowstone in style. A portion of the profits from this t-shirt support Yellowstone Forever Institute, the nonprofit fundraising organization for the park. $36; parksproject.us
Avoid getting lost by purchasing beautiful NatGeo maps that cover Yellowstone and more. $14.95; natgeomaps.com
LOWA Explorer GTX Lo
These lightweight dayhikers can be worn on Yellowstone’s trails and to dinner at the Old Faithful Inn. They are available in two colors and are waterproof and breathable. $200; lowaboots.com
Patagonia R1 Fleece Hoodie
This midweight layer treated with odor-reducing Polygiene is great for huge temperature swings. Light and warm, it proved to be an essential layer for our testers in seven national parks. $129; patagonia.com
Klymit Insulated Static V Lite
Calling all car campers and backpackers. Sleep more comfortably with Klymit’s v-shaped insulated pad. It’s one of the lightest and warmest sleeping pads on the market for under $100. $94.95; www.klymit.com
See our complete packing list.