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Oopsmark U Lock Holster Review | A Beautiful Bike Lock Mount

The Oopsmark U Lock holster is a high quality universal bike lock mount designed for use with U locks (D locks). I reached out to Oopsmark who were happy for me to produce an Oopsmark U lock holster review.

If you’ve been looking for a reliable & stylish way to transport your bike locks whilst cycling, keep reading.

Below I’ll let you know how the Oopsmark works, which bike locks it’s suitable for and where you can find it at the most affordable price.

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    About the Oopsmark U Lock Holster

    Hand-made in Montreal using naturally tanned leather, the Oopsmark U lock Holster is a universal U lock (D lock) mount with style.

    The naturally tanned leather the Oopsmark U Lock Holster utilises is vegetable tanned. Vegetable tanning doesn’t use harsh, toxic chemicals and produces a high-quality finish and leather that will last.

    It’s always nice to come across a company who manufacture their products without cutting corners.

    Oopsmark U Lock Holster box contents
    The Oopsmark provides a stylish, secure way to transport almost any U lock whilst cycling. Its also made with genuine naturally tanned leather.
    This bike lock mount will allow you to attach most U locks (D locks) to your bike and will hold them securely in place whilst you cycle.

    Which Bike Locks Does the Oopsmark U Lock Holster Work With?

    The Oopsmark Holster works with U locks that are from 4.5-5.5” wide. This means that the Oopsmark doesn’t accommodate for as many locks as the Huldit Bike Lock Holder, but will still be able to transport the majority of standard D locks.

    It’s worth noting that the Oopsmark Mount Doesn’t work with locks from the Kryptonite New York Range. If you’re looking for a mount for one of these locks, check out the Huldit.

    Before After
    The Oopsmark Holster fits U locks (D locks) that are 4.5″ – 5.5″ (11.4cm – 14cm) wide.

    You shouldn’t use locks that weigh over 5.5lbs (2kg) with the Oopsmark U-Lock Holster as this will cause the leather to stretch and wear out more quickly.

    To find out if the Oopsmark is suitable for your bike lock, get a tape measure or ruler and measure the width across the shackle of your bike lock (see images above for example of measurements).

    How to Attach the Oopsmark U Lock Holster to Your Bike?

    It’s very simple to attach the Oopsmark Holster to your bike. This can be done in one of two ways. You can attach the Oopsmark Holster to your pannier, or to the rear of your saddle.

    Attaching the Oopsmark Hostler to Your Saddle

    To attach the Oopsmark Holster to your saddle you’ll need a couple of bike saddle tabs. These can be purchased here from the Oopsmark website and will work with any regular saddle with two mounting tubes.

    Some retro bike saddles come with built-in tabs, so check your bike before buying new ones!

    Once you’ve got these tabs, attach them to the underside of your saddle facing outwards, as shown in the picture below.

    Saddle tabs are required to mount the Oopsmark Holster to your bike. I bought detachable ones available on the the Oopsmark website

    From here, you’ll want to fully loosen the straps from your Oopsmark Holster. Next, thread the straps back through the smaller opening in the holster, and then back through the larger opening.

    Once the Holster is in place on the back of your saddle, run the straps down to the break ridge (small beam which your rear break sits on).

    Finally, pulling the straps tight, get the two small screws (supplied in the box) and push them through the holes in both sides of the strap.

    How your Oopsmark U-Lock Holster should look when attached to your saddle.

    After tightening the hexagonal bolts, your Oopsmark U Lock Holster will be in place.

    If you get confused along the way, watch the video above for extra guidance.

    Attaching the Oopsmark Hostler to Your Pannier

    Attaching the Oopsmark Holster to your pannier is another great option. This is the way I mount my locks when using the Oopsmark Holster as it keeps your lock slightly more out of the way.

    Attaching your Oopsmark Holster is done in a similar way to the saddle.

    After fully removing the straps from your Oopsmark U Lock Holster, run the over the top of your saddle and back down through the narrow slit in the Holster.

    Oopsmark mounted to pannier with Zefal K-Traz U13 s

    From here thread the straps down through the larger hole just beneath the narrow slit and pull until taught.

    Now run the straps down towards the bottom of your pannier where it attaches to your bike. After looping them securely around your pannier, use the two small nuts to firmly hold your Oopsmark mount in place.


    If my instructions aren’t clear enough, watch the video further up the page. It will help you understand.

    How Much Does the Oopsmark U Lock Holster Cost?

    Considering the Oopsmark Holster is handmade, using naturally tanned leather and finished to the highest quality, I think it’s sold at a reasonable price.

    The Oopsmark isn’t as cheap as the Huldit Bike Lock Mount, but it’s made from much nicer materials and looks the part on any retro bike. 

    I found the most affordable and up to date price for the Oopsmark U Lock Holster on Amazon here.

    In my review of the 8 best universal bike lock mounts, I’ve included several affordable options alongside some more premium bike lock mounts, you can read the review here

    Using the Oopsmark U Lock Holster

    Once attached, the Oopsmark U Lock holster works a dream. It provides quick and easy access to your bike lock whilst you’re out and about. It also keeps your bike lock out of the way whilst cycling.

    The great thing about the Oopsmark Holster is that it doesn’t require any straps or velcro to hold your bike lock in place. Simply slide your lock in when cycling and out when locking up. No fiddling required!

    Most bike lock mounts out there are cheap and nasty! When using a cheap mount, your bike lock will rattle whilst cycling & may even scratch your bike.

    OnGuard Brute STD 8001 D Lock
    Whilst the OnGuard Brute is a great choice of lock, its mount is cheap and flimsy!

    Fortunately, the Oopsmark is completely silent whilst riding and the soft, durable leather won’t scratch your paintwork. 

    The only downside of the Oopsmark Holster is that you need a pannier or bike seat tabs installed on your bike to be able to use it.

    Most bikes will have one of these already, but if not either can be purchased cheaply online.

    Summary - Oopsmark U Lock Holster Review

    If you already use leather accessories (e.g. leather saddle or bar tape) or prefer a more vintage/rustic style of bike the Oopsmark U Lock holster will work well for you.

    It’s straightforward to set up and once it’s attached, the Oopsmark U lock Holster will hold your bike lock securely in place whilst you’re riding.

    The high quality naturally tanned leather and stainless metal that the Oopsmark mount uses, mean it will last even when left exposed to the elements.

    Oopsmark U Lock Holster Review

    As mentioned above, the only downside I found with the Oopsmark U Lock Mount was that you need a pannier or seat tabs installed on your bike before being able to attach it.

    If your bike lock is over 5.5” wide, your best bet will be the Huldit U lock mount, which comes in different sizes and has an adjustable strap (unlike the Oopsmark).

    Otherwise, check out some of your other alternatives in my review of the 8 best bike lock mounts.

    Apart from that I’ve enjoyed using the Oopsmark and wouldn’t hesitate to recommend it.

    If you’re thinking of buying a new bike lock, check out my suggestions below.

    And, as always, lock it, or lose it.

    Author of This Post:
    Picture of James Grear (Lead Editor)
    James Grear (Lead Editor)

    Understanding how devastating it is to have a bike stolen, I've researched & immersed myself in the world of bicycle security since 2013.

    I then built BikeLockWiki in 2019 to share everything I'd learned with the worldwide cycling community so that cyclists can improve their bike security skills and make informed decisions when purchasing new products and services.

    Learn More about Me & BikeLockWiki here.

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