Great bag for carry on luggage as it is the maximum legal size. Available in green or red for this price (black is $10 more).
Red: http://www.ebay.com.au/itm/OSPREY-PORTER-46-TREKKING-GEAR-HA…
Approved airline max carry-on size. The Porter series provides basic gear hauling ability in a stylish and organized backpack. With our StraightJacket compression WING system and padded foam walls all your gear stays organized and protected. The Porter provides gear hauling in a stylish backpack or duffle configuration.The Porter travel pack is Osprey Accessory compatible with D-rings for easy attachment. You can wear your Porter like a pack, using the easy-stow harness and fabric wing hipbelt or outfit it with our optional shoulder strap for over-the-shoulder carry
Weighs only 1.5kg
Dimensions: 56 x 36 x 24
RRP is $179.95 - http://www.ospreypacks.com/au/en/product/porter-46-PORTER46.…
Wildearth sells this for $159.95 - http://www.wildearth.com.au/buy/osprey-porter-46l-carry-on-u…
Video review - https://www.youtube.com/watch?v=ncSEA4y97iU
10% off Aussie Sellers in eBay in Selected Categories (Minimum Spend $30)
46 L? Maximum? I have a 50 L backpack that always makes it as carry on.