Here's what other sites are saying:
Sometimes backpacking expeditions or even day trips call for just a little more space, be it for tools, meals, or another layer. With the Klattermussen Sidepocket 2. 0 6L Pair in your gear closet, there's no reason to run out and buy a whole new pack. With these handy attachments you can choose to add 6 or even 12L of space to your person, and they come prepped for adventure.
Where to Buy
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Mystery Ranch Wet Rib
$30 - $40
Outdoor Research Water Bottle Tote Pack Pocket / Accessory
$12 - $16
Outdoor Research Backcountry Organizers
$32 - $39
Klattermusen Helmet Holder