Oknife LK Review: Does a Knife With a Built-In Flashlight Actually Earn Its Pocket?

It’s a familiar pocket-dump problem: knife in one pocket, light in another, and the one you reach for first is the one buried deepest. Oknife — the EDC arm of Olight — released the LK to address exactly that morning. M390 super steel, button lock, 400-lumen tail light, 3 ounces, $125 list. Half a knife, half a light, two compromises stapled together — or a real consolidation? Hands-on coverage from Gear Patrol and the manufacturer’s product page says the answer is more interesting than the spec sheet suggests.

Updated May 4, 2026.

What the Oknife LK actually is

Per Olight’s official product page, the Oknife LK is a 3-ounce folding pocket knife with a perpendicular tail-mounted 400-lumen LED flashlight, an M390 super-steel blade, a button lock, USB-C charging, and a multi-mode RGB secondary lighting system. Sold direct at $125. It is not a multi-tool with a knife taped onto it. It is a knife with a real light, made small enough that the combo is plausibly carriable in one pocket.

Per Gear Patrol’s hands-on coverage, the design choice that matters here is the perpendicular emitter — mounted on the side of the tail rather than the end. That orientation means the light works hands-free as a desk or bedside light when the knife is closed, and stays out of the way when the blade is deployed.

Specs from the manufacturer page:

• Blade steel: Böhler M390 powder steel, 61–63 HRC, dual-edge tanto with reinforced piercing tip
• Blade length: 2.48 inches; overall length: 5.94 inches; closed: 3.82 inches
• Weight: 3.03 ounces (86 grams)
• Lock: button lock with ball-bearing flipper deployment
• Light output: 400 lumens (high) main beam, 6500K cool white, plus RGB secondary module (white flood, red beacon, SOS, breathing modes)
• Max throw: 110 meters; max runtime: 13 hours total across modes
• Battery: built-in 340 mAh, USB-C charging, ~1 hour from empty
• Pocket clip: tip-up deep carry, included
• Body: aerospace-grade 6061 aluminum with Micro-Arc Oxidation (MAO) finish in Desert White, Black, or Tan
• IPX rating: IPX5 (water-jet resistant, dust resistant)

Two things to flag on the spec sheet. First, the IPX5 rating means rain, splash, and water-jet exposure are fine; submersion is not. Per the manufacturer, the open-port USB-C design is internally waterproofed, which is the trade-off for skipping the typical rubber port plug. Second, the 340 mAh battery is small enough that a buyer running the high-output mode often will be charging weekly.

The blade — what M390 buys at $125

M390 is the steel category buyers expect to see in folders priced $200+, not $125. Per Knife Steel Nerds testing summaries, M390 sits in the same edge-retention band as S90V and 20CV, with strong corrosion resistance. The trade-off versus newer steels like CPM MagnaCut is slightly lower toughness in exchange for excellent edge retention — well-suited to the EDC slicing-and-cardboard workload.

The button lock is the second design call worth flagging. Per the Olight product description, the LK pairs the button lock with a low-profile flipper for ball-bearing-smooth deployment. Gear Patrol describes the lock as “convenient, reliable, strong” — a notable rating in a category where button locks are often described as either too stiff or too loose.

The tanto-with-belly grind is the design choice the early reviews call out as distinctive. Per Gear Patrol, the shape gives the knife both a powerful piercing point and a belly suitable for steady cuts and forceful chops — the dual-section cutting edge that Olight markets as covering the full slicing-to-piercing spectrum.

The light — 400 lumens that fit a pocket-knife footprint

The light is the surprise. It is not a 30-lumen “find your keys” emitter. The high-output mode is rated at 400 lumens with a 110-meter throw — squarely in the bracket buyers want for parking lots, trailheads, and dark hallways.

Compared against a dedicated EDC flashlight in our EDC flashlight framework — most notably the Streamlight Wedge XT (manufacturer spec page: 500 lumens, IPX7, 4.25 inches, 3.3 oz) — the Oknife LK gives up 100 lumens on top end and gives up two IPX rating steps. What it adds back: one tool in the pocket instead of two, plus the RGB secondary modes (red beacon, SOS, ambient white flood, breathing) that the Wedge XT doesn’t offer at all.

The Mag Life’s Wedge XT review and 1Lumen’s testing both note IPX7 as a meaningful field-use advantage for the dedicated light. That’s the trade.

Where the combo earns its place

The argument for a knife-plus-light combo is strongest when the user reaches for both within seconds of each other. Use cases the format suits well:

• Dawn dog walks and trail starts — light up the path with the main beam, trim a tangled leash off a post with the blade.
• Truck-bed and after-dark utility work — pocket light + blade for unboxing, no rummaging.
• Travel — TSA-checked bag, one tool slot covered, no separate light to forget at the hotel.
• Roadside use — RGB red-beacon mode is a real signaling tool that a single-mode light doesn’t have.

Use cases the format does not suit:

• Hard-use jobs — drywall, roofing, work that dunks the tool. A dedicated kydex-and-steel setup is the better answer.
• Defensive carry — the button lock and 2.48-inch blade aren’t the right answer for either tool category.
• Light-dependent professions — EMTs, electricians, plumbers — the high-mode runtime is bounded by a single small cell. A dedicated workhorse light with a swappable battery is the right call.

Oknife LK vs. carrying both separately

The honest comparison is against a Civivi Elementum (3.0 oz, $80 street) plus a Streamlight Wedge XT (3.3 oz, $90 street). That’s 6.3 ounces and $170 in two pockets. The Oknife LK is 3.03 ounces and $125 in one pocket. The combo saves about half the weight, $45, and one full pocket — and gives up a half-step on each individual tool against the dedicated specialists. Per Gear Patrol: “a good deal more affordable than buying a separate knife and flashlight of similar overall quality.”

Who should buy this

The Oknife LK suits the buyer who carries a knife and a light separately, is tired of one of them, and is willing to give up IPX7 waterproofing and 100 lumens to consolidate. The Streamlight Wedge XT plus a Civivi Elementum is the better answer for buyers who treat their tools as single-use specialists or who work in conditions that demand water resistance.

This is not the right knife as an only knife for hard-use cutting. The 2.48-inch tanto and the small battery mean it’s a daily-carry tool, not a workhorse.

Frequently asked questions

Is the Oknife LK legal to carry in most U.S. states?

The 2.48-inch blade falls under the standard 3-inch limit in nearly every U.S. state. A few cities (notably New York City and Washington, D.C.) regulate folders by lock type and overall length — check your local ordinance before carrying. As of May 2026, no state preempts municipal blade-length restrictions, so the city rule wins.

How long does the flashlight battery last?

Per Olight’s spec sheet, total runtime is up to 13 hours across modes, with the high-output 400-lumen setting bounded by the 340 mAh cell. USB-C charging from empty takes about one hour.

Can the flashlight work while the knife is open?

Yes. Per Oknife’s design, the two functions are independent. The button lock for the blade and the tail switch for the light don’t share any internal mechanism, so the blade can be deployed for a cut and the light triggered at the same time.

Is M390 better than CPM MagnaCut for an EDC blade?

M390 has slightly better edge retention; MagnaCut has slightly better toughness and corrosion resistance. Both are top-tier “super steels” — Knife Steel Nerds testing summaries place both well above 90 percent of EDC use cases. For a $125 price point with a flashlight built in, M390 is a strong call.

Is the Oknife LK water-resistant?

Per the manufacturer, IPX5 — water-jet resistant and dust-protected. Rain, splash, and water-jet exposure are fine. Submersion is not rated. The open-port USB-C design uses internal waterproofing rather than a rubber plug.

How this review was sourced

Specifications, pricing, feature claims, and the Oknife LK product image are taken from Olight’s official product page for the Oknife LK MAO (verified May 4, 2026), the Amazon product listing, and Gear Patrol’s hands-on review. Steel comparison data references Knife Steel Nerds. The Streamlight Wedge XT product image and specs from Streamlight’s product page; review references from The Mag Life and 1Lumen. This is a synthesis review based on manufacturer data and published third-party coverage, not a first-party long-term test.

Cross-network read: PopularSuppressors.com — today’s stainless hunting can breakdown on the truck-rifle side of EDC.