I have a 35 mm kit nikon 801 with two lens , 35-70 2.8 & 80-200 2.8.Mamiya 645 super kit with 3 lens + linhof 4*5 field camera 1 lens w 6*12 roll film back. I feel i need a back pack with a good harness. Can the pro trekker be carried on as hand luggage.? Thanks David