That Manfrotto pack looks nice. Good for your purpose anyway. I have a pack I love a lot for Domestic travel - but its much longer - holds more Phantom gear- I carry 8 batteries- but no place for a laptop. Mine is for the P3P - This is the current model for the P4-https://microraptorcases.com/collections/customized-cases-for-dji-uavs/products/custom-backpack-fits-the-dji-phantom-4
Which size Edelkrone slider did you take? My guess is the 2' (600mm) but maybe you had to do the smaller one (400mm) for weight & size?
I got 600mm slider plus...
There is a disadvantage that the camera movement distance is short and a tripod is necessary. Portability is very good.