Review: Koki TukTuk Large Bicycle Seat Bag

Koki Tuktuk large bicycle seat bag review

I purchased the Koki TukTuk large bicycle seat bag in the spring of 2012, because I was looking for something very specific in a bike bag at the time. I was planning to ride the Shiner GASP 100, and I wanted to be able to fit two tubes, three CO2 cartridges and a patch kit inside my bag, along with two tire levers and a basic bike tool.

You see, the year before in 2011, I was riding with the lead group and flatted at mile 75 or so, and ended up riding the last 20 miles alone until a guy eventually caught me and I finished up with him. I flatted coming into a small town and rode my flat rear tire gingerly until I saw a spectator in a pickup who ended up having a floor pump, which allowed me to change my flat in just a minute or two. (I was carrying one of those tiny emergency pumps and would have taken 10 minutes at least to get enough air in my tire if I hadn’t found that spectator.)

In 2012, I not only had brand new tires, but tubes and CO2 cartridges to spare for the Shiner ride! Turned out in 2012 that I finished with the lead group of about six guys, with no mechanicals, so I didn’t need any of the extra stuff. But I sure had it ready in case I did.

So let’s talk about the bag.

It’s a very big bag, but it’s narrow and long, so it doesn’t rub against your legs when you are pedaling, and that is why I liked it. I also liked the very easy way that it attaches to the seat rails and seatpost. Velcro straps for the seat rails, and a rubber thing that goes around the seatpost and hooks back to the bag. Easy to take on and off, and also reliable and stable.

The inside of the bag is one big cavity, so it’s easy to arrange all your stuff inside. They also have a little keychain fob thing that you can attach to your keys, which means that even if you accidentally leave the bag unzipped and stuff falls out, your keys will still be secure! You’d probably hear the rattling, which would alert you to your problem.

The manufacturer describes the size this way:

SIZE :: 8×3.5×3 in
VOL :: ~80 in3
WT  :: 4 oz

Koki also makes a smaller “standard” version of this bag, which would be more suitable if you wanted to carry the typical single tube and basic tool assortment.

This bag is great, except for one major flaw, in my opinion.

If you look at the bag flap of the bag, you’ll see my problem with this bike seat bag. The rubber strap on the back that is described as a “rear blinky spider” is made out of rubber that is too soft and stretchy and not strong enough. I have three bikes and one blinky, so I have to move my blinker between bags and bikes. It was only after a few times of taking off my blinker that the strap broke, forcing me to clip my blinker on my jersey whenever I use that bag.

If you use a rear blinker and plan to take it on and off this bag, I’d say it is probably a deal killer. Other than that flaw though, the bag is a terrific large sized bag with lots of room in it. It’s well made in general, aside from the rear blinker strap.

Did I leave anything out? Leave a comment and let me know so I can update.


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