If you’ve ever worn your daypack and thought to yourself, “man, I wish this thing could compress to fit on my keychain,” maybe you’d be interested in the new Sea to Summit Ultra-Sil Daypack.

Stephen Regenold of The Gear Junkie got his hands on one and gave it a review, and said while it might not be up to snuff as a technical summit pack, it could be useful on short trips or for packing up dirty clothes at the end of a backpacking trip. I mean, if the thing can fit on a keychain when it’s fully compressed, there’s got to be some use for it, right?

It runs $28, weighs just 2.4 ounces, and has 20 liters of space when fully unfolded. In comparison, the REI Flash 18 I use as a summit pack weighs 10 ounces and holds 18 liters while retailing for about the same price. Huh – maybe the Ultra-Sil is worth a shot!

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Casey Schreiner

Founder and Editor-in-Chief at Modern Hiker
Since founding Modern Hiker in 2006, Casey's work on the site has appeared in regional and national publications, including the Los Angeles Times, National Public Radio, the Associated Press, CNN, New York Magazine, High Country News, and others. He has broken several national news stories about outdoor vandalism and policies and his first book "Day Hiking Los Angeles" is available for pre-order.
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This post was written by Casey Schreiner on January 13, 2010


  • Pablo says:

    Whenever I go into the wild, even for a day, the last thing I need is a key to open non-existent doors plus, the most important thing in a backpack, in my opinion is quality of manufacture. However, such a product could be useful for other occasions, such as when you go to the local market and don’t want to carry a bulky, empty bag. I wouldn’t use it for true outdoor adventures, but it could have some uses, nevertheless.

  • Ryan says:

    I got that thing for Christmas. Don’t bother. It is just a gimmick. Low quality and impossible to pack back up once it is taken out.

  • Modern Hiker says:

    Agreed. Honestly, I don’t know if I would be able to tell the difference between 2.4 ounces and 10 ounces when they’re rolled up in my backpack with 30 pounds of other stuff, and I like that the Flash 18 still has a dedicated hydration sleeve and options for attaching other pieces of gear if you needed them.

    This is kind of like a daypack concept car, then – cool enough to make you check it out, but probably not practical to actually use on the trail.

  • Raphael says:

    I’m a big fan of going ultralight, but I don’t really see the point with a daypack. Why worry about those last 8 oz when you’re just going a handful of miles?

    On the other hand, I like the idea of a daypack you can store in your pocket or glove compartment and take it out in case of emergency….

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