bauer traveler backpack Eddie Voyager 3.0 22L with Protected Laptop and Tablet Sleeves : Electronics The Eddie Bauer Trail Ends Backpack (28L) is designed for versatility Eddie Bauer Voyager 3.0 30L

Plus, its nicely padded and features a well-designed airflow system for comfortable carry

Adjustable back length and breathable mesh panel comfort for long shoots

Travel backpack cooler bag is suitable for office, picnic, beach, trip, travel, outdoor&indoor

Well, the first, most obvious clue is to check the patent number on its box or lips

Specs: Mens Short: Torso Length: 15-18 Pack Weight (with frame sheet and lid): 36.2oz Minimum Pack Weight (w/o frame and lid): 27.6oz Mens Regular: Torso Length: 18-21 Pack Weight (with frame sheet and lid): 37.8oz Minimum Pack Weight (w/o frame and lid): 29.2oz Mens Long: Torso Length: 21-24 Pack Weight (with frame sheet and lid): 39.4oz Minimum Pack Weight (w/o frame and lid): 30.8oz Womens Short: Torso Length: 15-18 Pack Weight (with frame sheet and lid): 36.2oz Minimum Pack Weight (w/o frame and lid): 23.5oz Womens Regular: Torso Length: 18-21 Pack Weight (with frame sheet and lid): 37.8oz Minimum Pack Weight (w/o frame and lid): 29.2oz *If you are willing to spend a bit more, the Crown 3 has an optional aluminum stay frame for holding heavier loads