Whether you are opening packages, cutting cardboard, or working on projects around the house, a compact folding utility knife can be a handy tool to keep nearby. In my latest everyday-carry video, I put the OKNIFE U1 Ultra folding utility knife to work on those exact jobs. OKNIFE sent me the U1 Ultra to review, and I used it to open boxes and cut directly into cardboard.
The clip is a short demonstration of the ceramic blade, the brushed aluminum handle, and the three opening methods on the folding mechanism. It is not a durability lab test, and I do not compare blade hardness or edge retention against a steel utility knife with measurements. The material claims, hardness rating, dimensions, and warranty details below come from OKNIFE and the Amazon listing, alongside the box-cutting footage and narration in the video.
OKNIFE sent me this U1 Ultra folding utility knife to review. As an Amazon Associate, I earn from qualifying purchases. If you buy through links in this post, I may receive a commission at no additional cost to you.
Screenshots in this post are from my YouTube video.
Folding utility knife at a glance
OKNIFE sent me this U1 Ultra folding utility knife to review. As an Amazon Associate, I earn from qualifying purchases. If you buy through links in this post, I may receive a commission at no additional cost to you.
| Feature | What the sources say |
|---|---|
| Model | OKNIFE U1 Ultra pocket folding utility knife; the olive green version shown in my video |
| Blade | Replaceable zirconium oxide ceramic utility blade, according to OKNIFE and my narration |
| Advertised hardness | 1,200HV, according to OKNIFE; not measured in my video |
| Handle | OAL aluminum with a brushed, anodized finish; I describe it as a premium-looking metal handle |
| Opening methods | Thumb stud, flipper, and button lock, as I show and as the listing states |
| Blade retention | Screw-secured blade designed to limit movement while cutting, per OKNIFE and the video |
| Carry | Deep-carry pocket clip, according to the listing; I show the clip on the closed knife |
| Listed size | About 5.74 inches overall and 2.36 inches of blade length, per the Amazon listing and OKNIFE |
| Warranty | Lifetime manufacturer warranty, according to the listing |
| Price and rating | About $55 on Amazon, with a 4.4-star rating from a few hundred reviews on the parent listing across colors; prices and offers can change |
The specifications above come from the Amazon listing linked here, from OKNIFE’s product description, and from what I show in the video. The olive green handle in the footage has a tan, khaki-looking anodized finish under indoor light, which matches OKNIFE’s olive green version of this model. The 4.4-star rating is from the parent Amazon listing, which covers more than one handle color.
What my video shows first: opening boxes and cutting cardboard
After I explain that OKNIFE sent the U1 Ultra for review, I put the knife to use on everyday packaging. First, I use it to open a few packages, cutting through the tape to get inside. I also try cutting directly into the cardboard itself to see how the blade handled a thicker material. Those two tasks — slicing packing tape and cutting the box wall — are the core of the demonstration.
In the footage, the white ceramic blade is easy to pick out against the brown cardboard. After a pass along a box seam, the cut is visible in the corrugated wall, and I hold the open knife up so the blade, the black blade holder, and the aluminum handle are all in frame. This is a real-use look at a common utility-knife job, not a claim about how long the edge will last after weeks of warehouse work.
I come back to that same point at the end of the video. Being able to use the knife for opening packages and cutting cardboard, I say, makes it a useful tool to keep around. If those are the jobs you buy a folding utility knife for, the footage is a direct look at that use. If you need prying, twisting, or heavy demolition cuts, this video does not show those tasks.
Zirconium oxide ceramic blade
One of the biggest features I call out is the ceramic blade. Unlike traditional steel utility blades, this one uses zirconium oxide ceramic, which is designed to resist rust and maintain a sharp cutting edge. That is the explanation I give in the narration while the blade is on camera: ceramic instead of the usual steel, with rust resistance and edge holding as the intended advantages.
OKNIFE’s listing adds numbers I do not test in the clip. The company advertises a 1,200HV hardness rating and says the ceramic edge is meant to stay sharp much longer than steel, while also resisting corrosion and staining. The listing also cites an 85% blade-utilization figure. Those are manufacturer-advertised specifications. I do not measure hardness, and I do not run a timed edge-retention comparison, so nothing in the video should be read as confirmation of those figures.
Ceramic also has a well-known handling limit, and OKNIFE’s own product materials treat it as a precision cutting blade rather than a pry bar. The company and the product description note that ceramic can chip or break if it is twisted, dropped, or put under sideways pressure. I do not perform a break test in the video, but that caution is worth keeping in mind if you are used to leaning on a steel utility blade.
The blade is also a replaceable trapezoidal utility blade, according to OKNIFE, and it is held with a screw-secured design. In the video, I mention that screw-secured layout as a way to keep the blade firmly in place while cutting. I do not change the blade on camera, so blade swaps and compatibility with standard utility blades remain listing features rather than steps in this demonstration.
Aluminum handle, three opening methods, and the pocket clip
Another thing I like is the aluminum handle. I describe it as having a brushed-metal finish that gives the knife a premium appearance while keeping the overall design compact enough to carry around. On the closed knife, that finish and the black clip, screws, and “U1 Ultra” marking are all easy to see. OKNIFE calls the handle material OAL “super aluminum” and says it is anodized for scratch resistance. The look and the compact size are what I talk about on camera; scratch-resistance claims come from the manufacturer.
I then show the folding mechanism. The knife offers three different ways to open it, including a thumb stud, a flipper, and a button-lock mechanism. Those three methods are a main talking point in the video and match the Amazon listing. After use, I note that you can fold the blade back into the handle for storage. The clip itself is visible on the closed handle in the footage; OKNIFE describes it as a deep-carry pocket clip, though I do not show the knife clipped in a pocket.
Who this folding utility knife is for — and what my video does not show
From the footage, the U1 Ultra fits someone who wants a compact folding utility knife for packages, cardboard, and similar household cutting, and who prefers a metal handle and a ceramic blade over a basic plastic box cutter. I close by saying that if you are looking for a compact folding utility knife with a ceramic blade and a premium aluminum handle, the OKNIFE U1 Ultra is definitely worth considering.
The video is short, and the limits should stay in view. I do not time how long the ceramic edge stays sharp, do not show a blade change, and do not cut anything other than packing tape and cardboard. Manufacturer figures such as 1,200HV hardness and 85% blade utilization are listed claims, not measurements from this review. The Amazon price I cite is about $55, with a 4.4-star rating from a few hundred reviews on the parent listing; offers can change, so confirm the live listing before you buy.
Bottom line from my video
My closing impression is that I like the compact folding design, the aluminum construction, and the ceramic blade. Opening packages and cutting cardboard gave me a straightforward look at how the U1 Ultra handles the jobs most people buy a utility knife to do. The three opening methods, the screw-secured blade, and the pocket clip are the other features I point out as part of that everyday-carry layout.
If that combination matches what you need, check the current OKNIFE U1 Ultra on Amazon listing for the live price, the available handle colors, and the latest rating. The olive green version in my video is the one I used on the boxes. Treat the hardness and edge-life claims as manufacturer specifications, and use the ceramic blade for controlled cuts rather than prying or twisting.
Notes and disclosure
OKNIFE sent me this U1 Ultra folding utility knife to review. As an Amazon Associate, I earn from qualifying purchases. If you buy through links in this post, I may receive a commission at no additional cost to you.
Primary sources: my OKNIFE U1 Ultra video and description, the Amazon product listing linked above, and OKNIFE’s product information for the U1 Ultra. Hardness, blade utilization, handle material, dimensions, clip design, and warranty are attributed to those sources. No independent laboratory measurement is claimed. Prices and offers can change.