Thermal clothing and rainwear should have fast access spots, and the heaviest stuff should be against your back, while items that are not often needed can be stored lower down. Many rucksacks have a separate pocket in the back, these are pretty good for hydration packs. Don't forget a waterproof stuffsack or two. On longer trips a compass, maps and first aid kit are pretty relevant.
3.99 USD
78.99 - 103.99 USD
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39.99 - 49.99 USD
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49.99 USD
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29.99 USD
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78.99 USD
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10.99 USD
5.99 - 7.99 USD
123.99 USD