Introducing the Island Hopper 2.0 NOW AVAILABLE! Just as amazing as the original with some cool upgrades Free YKK S-Clip Included with Purchase! 34L has a new hide-away waist belt - just tuck the waist straps away when you don’t need them.  28L does not have a waist belt, only the adjustable chest clip New water resistant front access zipper - perfect for easy-access while traveling for essentials like charging cables and phone. New Gear Loops added at the top to attach hats and neck pillows. Free YKK S-Clip Included to attach travel accessories like a neck pillow or hat Re-designed Ergonomic Shoulder Straps New Waterproof Ripstop Exterior encompasses the entire backpack. This material is stronger and lighter Added cushioning on the laptop sleeve to withstand drops New Increased Size Water Bottle Holder, holds up to a 34 oz water bottle. Luggage style opening Two (2) hidden pockets on the back-panel for travel documents. One zipper is hidden under the carry-on luggage handle wrap and not visible to the eye. Multiple Pockets for sunglasses, chargers, snacks etc. 34L only 2.5  lbs - 28L only 2.0 lbs.- nearly falf the weight of comparable travel backpacks! Carabiner attachments Massive space on the inside for shoes and multiple days on the road. Dimensions of 34L: 19.15" X 11.25" wide X 9.75" deep (Yes it will fit under the seat) Dimensions of 28L: 19" X 11" X 9.25" (Yes it will fit under the seat)