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Osprey [osprey.com] has Osprey 30L Arcane Duffel Over the Shoulder Carry Pack (Stargazer Blue) on sale for just $42. Shipping is free.

Product Details:[LIST][*]Tuckaway shoulder straps convert the bag from an over-the-shoulder duffel to a backpack[*]Meets carry-on size restrictions for most airlines (18.5H X 12.2W X 10.63D inches)[*]Direct zip access to padded laptop sleeve (fits up to most 15″ laptops)