Tortuga Backpacks are designed by two travel veterans. After a backpack journey they noticed that all backpacks and other bags and suitcases have their own advantages and their own disadvantages. They decided to develop their own backpack. Main feature is that you can open the backpack in the same way as a suitcase. This makes the backpack more suitable for travelling. Most backpacks are designed more for hiking than for travelling and open therefore from the top.
They don’t sell their products in physical shops but on-line only.
After a little research it turned out that Osprey also has a backpack what can be opened from the front instead of the top. Their backpack is called the Osprey Porter 46. The following youtube movie compares these two.