Hello Travelling with Loganair up to Scotland for wildlife photography and need a suitable back pack for Canon Eos 5 (650g) and Canon RF100-500n(1530g) making total of 2180g ie 2.1 kg The restrictions are 35 cm (width) X 40cm (length) X18cm depth) with weight allowance of 6 kg Ideally I would like to pack my laptop into this as well. It measures 24" X36" I just wondered if someone can kindly recommend a backpack that fits the measurements. Grateful for any advice!