ZPacks Cuben Fiber 18 x 36 Dry Sack Pack Liner

I am happy with my (1.2 oz) ZPacks cuben fiber pack cover and have no plans to abandon it, but past experiences have proven that a pack cover will not keep the inside of a pack dry on its own. And now that I have started carrying more down items I figured it would be wise for me to pick up a waterproof pack liner. But after thinking about it, I decided I didn’t just want a pack liner that I would be swapping out every so often. Instead, I wanted to look for a fully waterproof dry sack that would function as a pack liner. So, I began looking for one that would fit inside my ULA Circuit as best as possible.

Thanks to one of Wallace Hunter’s AT videos I came upon the Outdoor Research UL Dry Pack Liners which sounded great and looked like it would fit great in the ULA Circuit, although I didn’t like the sound of the added weight. I then came across Lawson Kline’s cuben fiber dry sack and this one was exactly what I was looking for! Very light-weight and clear so I could see through it. However, I waited just a little too long, and now he is busy working on his tarp line-up so he is not currently making any more of his dry sacks. So, I kept looking…

I looked at the Mountain Laurel Designs large size dry sack bag, but it was just a tad smaller than I wanted. I was stuck on the size 18×36 and this one measured 17×35. (Yeah, I was being nit-picky here.) But at the moment, this one was leading the pack since Lawson’s were out-of-the-question for the time being. And the price was pretty nice on this one too, $37.

Now, of course I also checked at ZPacks, but there was nothing listed on the site that was even a dry sack, let alone big enough for what I wanted. So, I figured what the heck and emailed Joe. He quickly returned my email and told me it would be no problem to make a dry sack to my specs. He even included some estimated overall weights using various weights of cuben fiber. So, I picked the weight I wanted, added it to the custom button and submitted it. About a week later it was in my mail box…

So, in case you missed it in the video, here are the specs on this dry sack:

~Measured Size Laying Flat: 18×36 inches
~Measured Weight: 1.7 oz before seam sealing, 1.8 oz after seam sealing
~Capacity: approximately 2400 cubic inches or 39 liters
~Material: 1.26 oz/sqyd Black Cuben Fiber
~Envelope Shaped

If you can’t tell from the video, I am very happy with this dry sack pack liner. It fits inside my ULA Circuit perfectly, it is very light-weight and being that it is made from cuben, it should be very durable (much more so than a trash compactor bag or some of the cheap pack liners). And of course, Joe has done a superb job, both on constructing as well as designing this dry sack. The hook-and-loop fastener that runs across the top not only makes it easy to close the top of the pack, but it also keeps the top stiff making it easier to roll closed. And of course, the highly waterproof cuben fiber should do a great job at keeping my gear dry!

So, thanks for taking the time to read this post as well as watch the video. If you have any questions just drop them at the bottom of the page and I will get back to you!


7 Responses to ZPacks Cuben Fiber 18 x 36 Dry Sack Pack Liner

  1. Adrian Redgwell says:

    Sorry to bother you, what about the OHM 2.0 is there a way to get the exact size for the zpack liner? Please advise and thanks. I will be looking online too.


    • Stick says:


      Note that when I got mine, it was a special request, however, now they are a permanent part of what Zpacks offers. The size of mine is listed above, but I believe that the one that Zpacks sells now is slightly bigger. Either way, I can say that it fits great in the OHM 2.0 too (my son had one). Hope this helps.



  2. Casey says:

    Awesome, it looks like I will go with the 18’X36″ then. I was just worried that the pack liner would exceed its capacity limit and leave unused empty space around the liner in the pack after someone on another site mentioned this. And yes I was looking into the Lawson dry bags because it doesn’t need to be seam sealed.

    Thanks for the quick reply!


    • Stick says:


      Cool, glad I could be of some help. Let me know what you think of Lawson’s dry bags once you get one! And again, with my dry bag, it fit’s perfect. There is no useable space between the pack and the liner. But like I said, it doesn’t bulge the sides of the pack out so the outside pockets are able to be used just as they were designed to be used. At this point, I can’t see going without a dry bag such as this again.



  3. Casey says:

    Hey Stick,

    Do you think you could get more use out of the ULA Circuit pack with a 20″x40″ pack liner compared to the 18″X36″?



    • Stick says:


      Sounds like maybe you are checking out one of Lawson’s dry sacks? I still want to try out one of his and hopefully one day I will get too!

      Concerning your question, I don’t see how I would get more use of of the pack with a 20 x 40 pack liner. The 18 x 36 really does fit like a hand in a glove. But of course, it won’t make it worse. It will still fit fine and I don’t figure that the few extra inches would be enough to cause any concernable bunching. After having the 18 x 36 though, I have decided that it is what I will stick with for this pack. In my opinion, anything more is only extra weight, but that is my opinion. Maybe if you had need of that size of a sack out of the pack, then it would make more sense to me.

      What I really like about this size is that it fits great around the sides which means items don’t accidentally bulge out and occupy my side pocket space. Also, it is the same height as my pack. This is great considering I have to roll down the pack as well as the pack liner, so I don’t find that there is really any lost space there. As well, I can fit everything that goes inside my pack inside the liner so it all stays dry, not just my quilt and clothing. I like it better this way.

      If anything, I would just recommend getting the envelope-shaped pack liner to use with the Circuit. The bottom of the Circuit tapers, and the envelope shaped liners will also taper at the bottom. There again, a perfect fit, at least in my opinion.

      Anyway, sorry for dragging it out, but I really love the way this pack and this size/shape pack liner fits together. If you need any more pics or have any more questions just let me know and I will do my best to answer your questions.

      Thanks for stopping by and commenting!



  4. Pingback: ZPacks Now Sells Cuben Fiber Roll Top Dry Bags & Pack Liners | Stick's Blog

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