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Either should be fine, the M size may not fully cover it if you have the backpack stuffed to the max. On the other hand, as of right now it's a difference of 0.2 oz + $3 between the two, so if you...
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Either should be fine, the M size may not fully cover it if you have the backpack stuffed to the max. On the other hand, as of right now it's a difference of 0.2 oz + $3 between the two, so if you...