Here's what other sites are saying:
Outdoor Research Isolation Pack LT Unisex Lemongrass/Pewter One Size 244020-lemgr/pt-1size. The Isolation Pack is perfect for peak-bagging side trips from base camp but is equally useful as a gym bag or around-town backpack. The zippered internal pocket secures items and the foam back panel provides support but can also be removed when weight and size are crucial.
Where to Buy
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Outdoor Research Isolation Pack
$35 - $47
Outdoor Research Isolation Pack HD
$45 - $60
Outdoor Research Dry Isolation Pack Daypack (under 2,000 cu in) / Dry Pack
$44 - $59
Osprey Talon 11
$75 - $100
$44 - $79
Gregory Miwok 18
$55 - $99