I'm an Outdoor Expert at Wirecutter. Here Are the Best Deals We've Found From REI's Big Sale.

Lowa Renegade GTX Mid Hiking Boots

Ideal for carrying a heavy pack during cold-weather hikes, these boots provide good ankle support and traction, even when trekking over loose, rocky terrain. The lacing system locks your heels in place, and the tongue comes up high enough to prevent dirt from getting in your shoe.

These boots aren't as well ventilated as our picks, but they offer excellent traction—even over loose rocks—and good ankle support if you're carrying a heavy pack. The lacing system locks heels in place, and the tongue reaches high enough to keep debris from spilling into your shoe.

Other things to know: An all-leather upper and insulated insoles make these boots too hot for hiking in warmer temperatures. Multiple testers reported these boots were stiff out of the box and required a lot of breaking in.

Danner Trail 2650 Hiking Shoe

A low profile and mesh exterior make these lightweight hiking shoes ideal for shorter day trips, when you don't need full-on boots that lace up to the ankle. The toe box isn't overly narrow or restrictive, and there's zero break-in time, so you can jump feet-first into warm-weather adventures.

Great for situations when you don't need full-on hiking boots that lace up to your ankle, these hiking shoes have a wide, roomy toe box, and no break-in time is needed. With a low-top style and mesh exterior, they're ideal for warmer weather.

Other things to know: Low-top style is ideal for shorter day hikes and situations when you don't need full-on hiking boots that lace up to your ankle. Available in multiple colors and sizes.

Outdoor Research Swift Training Cap

This running cap offers more than a comfortable, secure fit and a sleek silhouette. Our fitness experts swear by the protective, cooling design of this hat: It has a ventilating mesh liner, UPF 50 fabric along the crown, and a brim that provides solid coverage from the sun.

Other things to know: Made to fit heads 21.5 to 24 inches in circumference. Available in three color options. Opt for store pickup or use REI membership to avoid shipping fees.

REI Co-op Midweight Base Layer Crew Top

Made from a blend of polyester and spandex, this synthetic long-sleeve thermal underwear top is a great option for those who prefer to avoid merino wool. Whether you layer it or wear it on its own, this shirt is soft and fitted, without being too tight for all-day wear.

For those who prefer to avoid merino wool, this synthetic long-sleeve thermal underwear top is soft enough to wear all day. It's fitted without being too tight, and you can layer it or wear it on its own.

Other things to know: A good choice if you aren't ready to invest in wool thermal underwear, though you may need to wash it more often. Free shipping for REI members. Non-members can opt for store pickup or get free shipping on combined orders over $60.

REI Co-op Midweight Base Layer Bottoms

These stretchy, ultra-comfortable leggings are made from a blend of polyester and spandex, so they're form-fitting without feeling overly tight. They're substantial enough to be styled on their own, but you can also layer them under your clothes for extra warmth on chilly days and nights.

Stretchy, form-fitting, and extremely comfortable, these base-layer bottoms deftly transition between outdoors and indoor activities. They also have a fly, which is something even pricier leggings often don't have.

Other things to know: No longer a formal pick, but we did test and do recommend these bottoms. None of our testers had anything bad to say about this option, but we think merino base layers are a better investment. Opt for store pickup or use REI membership to avoid shipping fees.

Mountain Hardwear Mineral King 3 Tent

Durable, lightweight, and spacious, this tent offers ample protection against the elements for three seasons of multipurpose camping. It has a full mesh dome that allows for a closer connection to nature, though we recommend sleeping with the adaptable fly secured.

Other things to know: Easily fits two people at 42.5 square feet. Comes with only six ground stakes.

Coleman Cascade 222 2-Burner Camping Stove

We recommend this camping stove for its greater precision control over cooking temperatures. It boils water a bit faster than our top pick and has a handle, so it's easier to carry.

Other things to know: Heavier and more expensive than our top pick. Has a piezo electric ignition, which tends to break over time. Three-year limited warranty.

Nemo Disco 30 Sleeping Bag

Ideal for side-sleeper backpackers, this sleeping bag's zippered "thermo gills" provide ample ventilation for those who tend to sleep hot. It was a solid performer during our tests, and we particularly liked the giant draft collar and stretchy hood cinch cord.

In our testing, we liked the giant draft collar and stretchy hood cinch cord of this sleeping bag. Its zippered "thermo gills" offer plenty of ventilation for side-sleepers who get warm easily.

Other things to know: We couldn't lie comfortably in a fetal position, and the exterior zippered pocket barely fits a phone. Available in regular and long lengths.

Exped MegaMat Duo 10 Sleeping Pad (Medium)

A wilderness luxury, this astonishingly comfortable couple-sized sleeping pad accommodates side-sleepers' hips and shoulders while providing good lower-back support for stomach- and back-sleepers. It's the largest and warmest option we tested, and it also self-inflates.

Other things to know: Somewhat cumbersome to pack, inflate, and carry. 3.9 inches thick. Weighs about 7.5 pounds. Deal price is for the medium double size.

Exped MegaMat 10 Sleeping Pad (Regular Wide)

Ideal for three-season camping, this sleeping pad is self-inflating, durable, and well insulated. It provides optimal cushioning and warmth while you sleep, and it can also be used as an exercise mat, if you need to stretch during the day.

Other things to know: 4 inches thick. Comes with a carrying pack. Deal is for the regular wide size.

REI Co-op Kindercone 25 Kids Sleeping Bag

Our kid testers loved this sleeping bag the most—and the adults did, too. It has a recycled polyester shell and lining to insulate against the cold, and it's coated with a durable water repellent. An added bonus is the handy cinch feature, which customizes the sleeping area based on your child's size.

Other things to know: Bulky when packed, making it better suited to car-camping and sleepovers than backpacking. Stuff sack is permanently attached to the foot of the bag, making it easy to pack and keep track of. Available in limited colors.

REI Co-op Kindercamp 40 Kids Sleeping Bag

This rugged rectangular sleeping bag has a polyester construction that's similar to that of our top pick. But it lies flat when unzipped, so it can double as a comforter at camp or at home.

Other things to know: Temperature rating of just 40˚F, not as warm as our top Kindercone 25 pick. Roomier than a mummy-shaped sleeping bag.

REI Co-op Expandable Packing Cube Set

Don't break a sweat cramming that last T-shirt into your bag. These lightweight ripstop-nylon cubes held the most of any set we tested, while taking up the least amount of space when fully compressed. They have two zippers for you to adjust their size, so you may even have extra room for souvenirs.

Other things to know: Compression zippers can be finicky. Set includes three cubes—small, medium, and large. Opt for store pickup or add to an order of $60 or more to avoid shipping fees. REI members get free shipping.

Outdoor and camping-gear deals

Whether used indoors or outdoors, this reliable headlamp is bright enough to light the way in most situations. On top of its easy-to-navigate buttons and a long-lasting battery life, it also features a bright beam, with the option of two beam shapes and two colors.

Other things to know: You'll have to experiment with clicking through the various modes, but the learning curve is fairly quick. REI members get free shipping. Otherwise, opt for store pickup to avoid shipping charges. Available in multiple colors.

This inexpensive yet reliable headlamp is just as bright as our top pick—but it's half the price (and it weighs less). With a 10-hour battery life when used on high, this lamp is a solid choice for tinkering around a campsite or your house.

Other things to know: Not quite as comfortable to wear and lacks some useful features. No battery light indicator or red light. REI members get free shipping, but others can opt for store pickup.

Hit the trail with your tot—and the roomiest seat of any hiking carrier we tested. This carrier is a great choice for anyone with a kid who likes to take frequent trail breaks to explore. Plus, you'll appreciate how the attached sunshade folds into its own pocket so it doesn't get lost.

Other things to know: We wish it had more padding on the hip belt. New low price. Choose black or blue. From REI, opt for store pickup to avoid $30 oversize shipping fee. Other retailers offer free shipping.

Adventure Medical Kits Mountain Series Backpacker Kit

This compact first aid kit is well-stocked with clearly labeled pockets and high-quality supplies. Great for weekend campers and hikers, it offers a wide range of items to address common first aid needs.

Other things to know: Unique organizational system is odd but makes finding items easier than with any other kit we tested. Opt for store pickup to avoid shipping fees or add to order over $60. REI members get free shipping.

Ruffwear Front Range Harness

This dog harness proved to be sturdy, lightweight, and comfortable, and it didn't twist or slip around on our canine testers' bodies. Its head-in design includes several built-in safety details, like reflective stripes and an ID pocket.

Other things to know: Fits most dogs with chests ranging from 13 to 42 inches, but it might be too bulky for some smaller dogs. Six colors. Select store pickup or use REI membership to avoid shipping fees.

Editor's note: The photo at the top of this article may reflect previous deals that are no longer valid and have been removed. Check out our Deals page for more great discounts on Wirecutter's expert-approved picks.

This article was edited by Janie Campbell and Nathan Burrow.