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REI [rei.com] has Gregory Rhune 25L Backpack (Blue) on sale for $54.73. Shipping is free w/ REI Co-op membership [rei.com] ($30 lifetime), free on orders $60+, or free in-store pickup; otherwise $7.99 shipping under $60.

Note: This item meets carry-on size restrictions for most airlines (size not to exceed 45 linear inches when adding L+W+H); verify with your airline.

Compare to Gregory [gregory.com] at $112.46.