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Nite Ize S-Biner SlideLock Review

The S-Biner SlideLock is a locking version of Nite Ize’s popular S-Biner, making it a dynamic travel companion with endless uses while away from home.

Our Verdict

8.2 /10
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  • Extremely lightweight for its capacity
  • Three sizes for different shaped gear
  • Locking mechanism is easy to use


  • Aluminum chips fairly easily
  • Smallest can be hard to manipulate
  • Not as strong as the steel option

Technical Details

  • Weight (oz)

    0.1 oz (2.8 g)

    Size #2 | 0.3 oz - Size #3 | 0.7 oz - Size #4

  • Dimensions

    0.9 in x 2 in x 0.4 in (2.3 x 5.1 x 1 cm)

    Size #2 | 1.2 in x 2.7 in x 0.4 in - Size #3 | 1.7 in x 3.6 in x 0.6 in - Size #4

  • Notable Materials

    Aluminum, Stainless Steel

  • Warranty Information

    Nite Ize Worry Free Guarantee

Buying Options

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Full Review

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We’ve been a big fan of the S-Biners from Nite Ize for quite some time. They’re more dynamic than a standard carabiner, at least as far as travel is concerned, and we rarely go on a trip without at least one. We’ve used the stainless steel non-locking models in the past, and we’re curious to see how the aluminum model holds up against it. Is losing the weight worth it, or will we wish that we had stuck with the more durable option? Let’s find out!

Materials & Aesthetic

Kicking things off with the design, the S-Biner is, as the name describes, shaped like an S. If you flip it over, it looks like a curved Z-shape, but you get the picture.

Nite Ize Biner Slidelock Aluminum Cap
Nite Ize S-Biner SlideLock | The S-Biner in use.

Because of the S-shaped design, there are two clip areas. The middle of the clip runs diagonally through the center, making it two compartments instead of just one like you usually see This means that you can clip one half of it to an item, like a hat or water bottle, and the other half to something like a daypack, sling, or even a fence without as much fuss as a standard carabiner.

The two-tiered design enables you to attach things on either end without worrying about what you have on the other side falling off, as is a common issue with a standard carabiner. We dig the flat design Nite Ize employs here, as it gives the S-Biner a more tactical look.

Nite Ize Biner Slidelock Aluminum Red
Nite Ize S-Biner SlideLock | The #4 S-Biner.

Thanks to a little piece of hard plastic that slides up and down the clip, both sides are locking. It glides into a little nook on the side closest to the diagonal portion of the S and snaps into place nicely. When locked, the clip is very tight. You might be able to weave a piece of fishing line through, but we can’t think of anything else that would fit through the microscopically small gap between the clip’s closure.

The hard plastic piece that locks the carabiner can’t slide off either, as it has a small interior lip to prevent it from overcoming the metal clip. If you were to yank on it hard or take pliers to it, you might be able to get it off, but we’ve had no issues with it coming off during practical use.

Nite Ize Biner Slidelock Aluminum Lock
Nite Ize S-Biner SlideLock | The hard plastic locking piece.

We have several different S-Biners from Nite Ize on hand, but this is the first aluminum model we’re testing. The material is super lightweight and doesn’t have any heft to it when it’s in your palm. We have noticed the paint chipping and a few marks in the aluminum after a month of use, but none bad enough to stop us from using it.

The other models we have on hand are crafted from stainless steel, and while they may be more robust, aluminum is roughly one-third the weight of steel, so there’s a significant difference in weight. It might not seem like a huge difference for such a small item, but as anyone who has used our packing tool knows, every ounce counts!

Everything we have experienced with stainless steel S-Biners in the past translates well to the locking iteration—including strength and slightly higher weight.

Nite Ize Biner Slidelock Aluminum SML
Nite Ize S-Biner SlideLock | All three sizes.

At the time of writing, there are three different sizes for the aluminum model. The #2 measures 0.9” by 2″ by 0.4” (23mm x 50mm x 10mm), coming in at 0.2 oz. This is the only clip that can’t be purchased by itself—it currently only comes in the assorted pack, which we will talk about in a moment. The #2 is also the only S-Biner with black metal clips, as the rest are silver. To our knowledge, this clip only comes in Coyote, which is an earthy brown color that is sleek but has an outdoorsy feel to it.

The #3 measures 1.2″ by 2.7″ by 0.4” (31mm x 68mm x 11mm) and weighs 0.4 oz. At the time of writing, this clip is available in Coyote, Olive (a deep green), Orange, and Red colorways. You can purchase the #3 S-Biner separately or as a part of the assorted pack.

The #4 measures 1.7″ by 3.6″ by 0.6” (42mm x 91mm x 14mm), and we clock it in at 0.7 oz. At the moment, the clip is available in Blue, Coyote, Olive, Orange, and Red colorways. Like the #3 S-Biner, you can get this one by itself or in the assorted pack.

The stainless steel model offers roughly the same sizes as the aluminum iteration, but has a few different colorways, too.

The assorted pack we have on hand comes with #2 Coyote, #3 Blue, and #4 Red S-Biners. That is what Nite Ize has on their site at the time of writing, too, but we imagine it may be subject to change. We may have to get another set if it does—who doesn’t love having color options?

Nite Ize Biner Slidelock Aluminum SML 2
Nite Ize S-Biner SlideLock | Now that’s fun!

All three S-Biners weigh 1.3 oz, which feels comfortable enough to hold in your hand. Plus, you can attach them all into an S-Biner conga-line, which is fun.

Usage & Features

The sky is the limit with S-Biners as far as usage goes. Let’s go over a few options:

The #2 model is the perfect size to keep clipped to your key ring while traveling so you can attach your keys to something inside your pack. This also enables you to always have it on hand should you need it while exploring a new city.

Nite Ize Biner Slidelock Aluminum Keys 2
Nite Ize S-Biner SlideLock | It’s hardly noticeable on a key ring.

We’re able to attach the two larger sizes to a hat without issue, though we find that the #3 is the perfect size for us. If your ballcap gets wet and you don’t want it to get wrinkled inside your pack or if the sun is suddenly covered by clouds, you can fix it to an attachment loop outside your daypack or sling.

Nite Ize Biner Slidelock Aluminum Bag Cap 2
Nite Ize S-Biner SlideLock | Fixing a cap to the outside of your pack is easy.

The S-Biner makes hanging things more accessible in general. There isn’t always a good place to hang your backpack up at a hotel or Airbnb. However, if you have an S-Biner handy, you can attach it to just about anything. Use the top handle, attachment loop, or bunched together shoulder straps to hook the S-Biner to your backpack, then find an eye or loop in a piece of furniture, a banister, or even a fence. If you used the largest S-Biner to hook up your pack, but the arm won’t fit through the loop you’re trying to fix it to, add a smaller S-Biner onto it as an adapter for little hooks.

Nite Ize Biner Slidelock Aluminum Shoes
Nite Ize S-Biner SlideLock | Shoes are a piece of cake, too.

Even though these clips are incredibly lightweight, they’re strong enough to carry your soggy shoes on the outside of your pack, saving the rest of your gear from getting wet and muddy.

Or, if you like to keep a multitool handy, loop it onto an S-Biner and fix it to your belt loop.

Another dynamic use is for carrying water bottles when your pack doesn’t have a dedicated pocket. You can use it similarly to a pair of shoes on the exterior of your pack, or attach it inside, ensuring that your water doesn’t tip over because the clip is holding it upwards. Even if your bag has water bottle pockets, using an S-Biner is a great way to bring more hydration. Or, if the pocket space is taken up by other gear like a tripod, you can still bring water.

Nite Ize Biner Slidelock Aluminum Bag
Nite Ize S-Biner SlideLock | At the ready!

Overall, the Nite Ize S-Biner SlideLock makes things easier on the road. It’s one of those items you won’t miss until you don’t have it, and given how small and light they are, we can’t see any reason not to bring them along.

Usage Timeline

Initial Usage

Condition: Excellent

  • Three different sizes seem useful for different sized gear
  • S-design makes them easy to operate
  • They have little pieces of rubber to stay locked
2 Weeks of Use

Condition: Excellent

  • The paint has a few chips and nicks but is overall in good condition
  • No issues with clips loosening
  • Locks still pop in and out of position easily
By Eric Hergenreder
Created June 8, 2022 • Updated May 27, 2024
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