Sawyer Premium Insect Repellent 20% Picaridin Review

Overview

Sawyer’s SP544 is a 4-fluid-ounce pump bottle of 20% picaridin, the DEET alternative that has become the default skin repellent for backpackers who care about their trekking pole grips, watch crystals and rain shells. It works about as well as mid-strength DEET and costs roughly $11. The trade-off is the container: at 170 g, the full bottle is a lot of mass to carry for something most hikers use in drips and sprays.

Key Specs

Spec	Detail
Active ingredient	20% picaridin
Volume	4 fl oz
Weight	170 g (full bottle)
Format	Pump spray (non-aerosol)
Protection: mosquitoes and ticks	Up to 12 hours
Protection: biting flies, gnats, chiggers	Up to 8 hours
Gear safety	Won’t damage plastics or synthetic coatings
Scent	Faint citrus note that fades quickly
Shelf life	10+ years if stored cool, dry and out of direct UV (manufacturer)
Product code	SP544

Performance

Bug protection. Picaridin at 20% sits in the same effectiveness range as DEET of similar strength, and long-time DEET users who have switched say the Sawyer spray holds its own on mosquitoes. One Trailspace reviewer called picaridin the only repellent besides DEET to match it against mosquitoes and other biting insects. Sawyer rates the spray for up to 12 hours against mosquitoes and ticks and up to 8 hours against biting flies, gnats, chiggers and sand flies. Hikers who sweat heavily tend to reapply after lunch regardless, so the 12-hour figure is a ceiling, not a promise. Wirecutter and the New York Times named Sawyer’s 20% picaridin a top bug repellent in May 2020, and the Public Health Agency of Canada has recommended it.

Not every owner is convinced. A small number of buyers report being bitten despite thorough application and went back to DEET. Hammock campers who tried the 15% formulation with mixed results found the 20% version performed noticeably better, which is the formulation this bottle carries.

Gear safety. This is the main reason to pick picaridin over DEET. DEET is a plastic solvent that can cloud sunglasses, soften watch bezels and mar synthetic fabrics. Sawyer says the spray is safe on clothing, backpacks, watches, sunglasses, fishing line and firearm finishes. For anyone carrying a pack full of nylon, Dyneema and polycarbonate, that is a practical advantage.

On skin. The formula is non-greasy and dries quickly. Sawyer lists a mild citrus scent that evaporates fast, and owners generally describe it as close to odorless. One tester noted a slightly rubbery feel on dry skin right after spraying, which beats the oily film of many DEET products. Another reported using only about a third of an ounce over three days of backcountry travel with a repackaged sample, and said it didn’t stain clothing.

Pump format. This is the non-aerosol pump version. It sprays evenly but takes more effort than the continuous-spray cans, and one buyer called it “a little more trouble to apply” than an aerosol. Sawyer sells the same formula in continuous-spray cans for hikers who want hands-free misting. One buyer also reported a greasy residue on the outside of a new bottle despite two safety caps and a wrapper, so a zip-top bag is a sensible precaution in a pack.

Weight and quantity. The bottle is the weak point for ultralight use. At 170 g it outweighs many hikers’ entire first-aid kits. Consumption varies widely: a PCT hiker reported finishing a 2 oz bottle in two days near Mt. Thielsen, a notoriously buggy stretch, while drier regions barely dent a bottle. Most weight-conscious hikers decant into a 1 oz dropper or small spray bottle. The pump is not designed to be repackaged easily, so decanting by pouring is the usual route.

Treating gear. Sawyer recommends pairing the skin spray with its permethrin treatment for clothing and gear. Picaridin covers exposed skin, and permethrin-treated sleeves, socks and head nets cover the rest. That two-layer system is the usual approach for tick country.

Pros & Cons

Pros

• 20% picaridin gives up to 12 hours of protection against mosquitoes and ticks
• Won’t damage plastics, synthetic fabrics or coatings
• Non-greasy, dries fast, faint scent
• Cheap at around $11 and widely stocked, including at REI, which lists it at 4.6 out of 5 across 21 reviews
• Long shelf life, so a half-used bottle is still good next season

Cons

• 170 g is heavy for ultralight kits unless decanted
• Pump action is slower and fussier than a continuous-spray can
• Some users report skin feel as slightly rubbery, and a few say it underperformed against heavy mosquito pressure
• Bottle can arrive with residue on the outside

Who Should Buy This

This suits section hikers, weekend backpackers and base-camp users who want a reliable, gear-safe repellent and don’t mind a bottle that stays mostly in the car or the bear canister. It is also a good choice for tick country, where it can be paired with permethrin-treated clothing. Gram-counting thru-hikers should buy it for the formula and decant a small amount, or look at Sawyer’s smaller 3 oz size or a travel-size picaridin bottle. Hikers heading into extreme mosquito territory such as the Arctic tundra may still prefer a high-percentage DEET product, and should accept the gear damage that comes with it.

Verdict

Sawyer’s 20% picaridin pump spray is an inexpensive, proven repellent that protects both skin and gear, which is why it is the standard recommendation over DEET. The bottle is the only real knock. Decant it, pair it with treated clothing, and it earns a place in most three-season kits.