I have a small Kipling back pack which is not really big enough and I have a long haul flight coming up. It needs to fit under the seat in front and be flexible, not rigid, something more like a traditional backpack than a suitcase. Lots of zip up pockets would be useful. It needs to hold a small soft hand bag with makeup, tissues, sunglasses etc, tablet, cardigan, food, water bottle, book etc, Just stuff for the journey, no clothes. Possibly something like the Trespass Albus, but I'm wondering what the quality is like for that price. But I don't want something stupidly expensive that will only be used a few times a year. Any recommendations? Thanks in advance.