San Diego in November

For cool evenings after warm days.

SimondSimond Merino Resist Long-Sleeve T-Shirt - Men's$45Shop at Decathlon →PatagoniaPatagonia Capilene Cool Merino Blend Long-Sleeve - Women's$62.30Shop at Backcountry →SmartwoolSmartwool Merino Sport 120 Long-Sleeve Shirt - Men's$85Shop at REI →ColumbiaColumbia Summit Valley Long-Sleeve Crew - Women's$24.75Shop at Backcountry →

Merino or synthetic. Cotton holds the sweat and you'll smell it by day two.

SimondSIMOND Women's Travel 500 Merino Wool T-Shirt$49.99Shop at Decathlon →CoalatreeQuick Dry Short-Sleeve T-Shirt - Unisex$34.30 was $49Shop at Backcountry →KiprunKiprun Men's Run 500 Dry Running T-shirt$20 was $24.99Shop at Decathlon →ForclazSimond Women's Merino Resist Long-Sleeve T-Shirt$45 was $69.99Shop at Decathlon →

One pair for every two days, plus two.

SmartwoolEveryday Merino Bikini Underwear - Women's$34Shop at Backcountry →SmartwoolEveryday Merino Thong Underwear - Women's$34Shop at Backcountry →SimondSimond Trek 500 Merino Wool Backpacking Underwear Women's$29.99Shop at Decathlon →REI Co-opREI Co-op Women's Merino Hipster Underwear$29.95Shop at REI →

Trail runners dry overnight where boots take days, which is why most people prefer them on warm trails.

CraftCraft Women's Endurance Trail-Running Shoes$130 was $175Shop at REI →KiprunKiprun Kipsummit Men's Trail Running Shoes$130Shop at Decathlon →KiprunKiprun Kipride Women's Running Shoes$140Shop at Decathlon →QuechuaQuechua Men's MH100 Hiking Shoes$45 was $64.99Shop at Decathlon →

Buy it used: REI Re/Supply sells gear like this for less. See used gear

Bring the pair you already walk ten miles in. Brand new shoes on day one is how the blisters start.

NnormalKjerag Shoe$109 was $140Shop at Backcountry →SaolaQuito Shoe - Men's$130Shop at Backcountry →SaolaEzo Shoe - Men's$83.96 was $120Shop at Backcountry →New Balance530 Shoe$60.47 was $110Shop at Backcountry →

Polarized kills glare, but the tag has to say 100% UV separately, and that's the part your eyes need.

SmithSmith Era ChromaPop Polarized Sunglasses - Women's$113 was $189Shop at Backcountry →ZealZeal Isabelle Polarized Sunglasses - Women's$67.03 was $149Shop at Backcountry →CostaCosta Caleta Net 580G Polarized Sunglasses - Women's$174 was $248Shop at Backcountry →KnockaroundKnockaround Junipers Polarized Sunglasses - Women's$17.50 was $35Shop at Backcountry →

10,000mAh is about two phone charges, 5,000 barely gets you through one long day.

Top pickGoal ZeroGoal Zero Venture 75 Power Bank$120Shop at REI →BioLiteBioLite Charge 80 PD Power Bank$99.95Shop at REI →AnkerAnker Power Bank (30W, Fusion, Built-In USB-C Cable)$40Shop at REI →AnkerAnker MagGo Power Bank (10,000 mAh, Slim)$80Shop at REI →

REI members usually get 10% back on full-price gear. Membership is $30, once. How it works

65W or more charges a laptop. Anything smaller only keeps up with phones.

Peak DesignPeak Design 65W Dual Slim Charger$64.95Shop at REI →Peak DesignDual Slim Charger$64.95Shop at Peak Design →AnkerAnker Wall Charger (33W, 2-Port) with USB-C to USB-C Cable$25Shop at REI →AnkerAnker MagGo Wireless Charging Station (3-in-1, Foldable Pad) with Charger and USB-C Cable$100Shop at REI →

35 to 45 liters fits most cabins. Check your airline's size limit first. Most won't take much over 40L in the cabin.

Top pickMatadorMatador 45L Global Travel PackSee price15% off with CHRISANDSARAShop at Matador →MatadorMatador GloberiderSee price15% off with CHRISANDSARAShop at Matador →PacsafeGo Carry-On 44L Backpack$180Shop at Backcountry →Osprey PacksOsprey Packs Archeon 30L Backpack$132 was $265Shop at Backcountry →

Hard shell protects what's inside, soft shell squeezes into a tight bin, and either way check the size with wheels included.

CotopaxiCoraza Suitcase - Carry On$295Shop at Cotopaxi →SamsoniteHyperflex ∞ Carry-On Spinner$126 was $180Shop at Samsonite →SamsoniteVirtuosa Spinner$154 was $220Shop at Samsonite →ThuleThule Aion Carry On Spinner Nutria$350Shop at Backcountry →

15 to 25 liters.

CotopaxiElqui 24L Daypack$100Shop at Cotopaxi →MammutLithium 20L Daypack$135Shop at Backcountry →CotopaxiConsuelo 22L Daypack$120Shop at Cotopaxi →StioStio Basin Daypack$75.93 was $109Shop at REI →

Get locks marked TSA approved. Security can cut anything else off to search your bag.

MatadorMatador BetaLockSee price15% off with CHRISANDSARAShop at Matador →KnackKnack TSA-Approved Lock$16Shop at Knack Bags →ThuleTSA Cable Lock$17.95Shop at Backcountry →Samsonite3 Dial Travel Sentry Combination Lock$13Shop at Samsonite →

It runs on Find My, so this one's for iPhones.

AppleApple AirTag (2nd Gen, 4-Pack)$95.99Shop at B&H Photo →eufyeufy SmartTrack Link (2-Pack)$19.99Shop at B&H Photo →AppleApple AirTag (2nd Gen)$29Shop at B&H Photo →

Picaridin at 20% works as well as DEET, and it won't melt your sunglasses or the plastic on your pack.

Ben'sBen's Eco Spray Insect Repellent - 30 Percent DEET$9.50Shop at REI →Adventure MedicalBen's 30 Deet Tick & Insect Repellent$1.92 was $2.95Shop at Backcountry →Adventure MedicalAdventure Medical Ben's 30 Deet Tick & Insect Repellent Pump$1.92 was $2.95Shop at Backcountry →Ben'sBen's Spray Pump Insect Repellent - 30 Percent DEET$5.95Shop at REI →

Rechargeable over USB-C, so it shares a cable with everything else you carry.

FenixFenix HM50R V2.0 Rechargeable Headlamp$59.95Shop at REI →BioLiteBioLite Dash 450 USB-C Rechargeable Running Headlamp$69.95Shop at REI →BioLiteDash 450 Rechargeable HeadLamp$69.95Shop at Backcountry →Black DiamondStorm 450 Headlamp$38.47 was $69.95Shop at Backcountry →