Yes I certainly agree with your suggestion to hide the tripod in a bag. I may not have made myself clear. What I meant was, we would usually cover up the tripod in a black bag and just mount them on the backpack, so nobody can see the tripod but only a black bag.
That is the best we could do at this moment, as it is definitely more convenient to carry only the backpacks without another bag to sling.
becare ful if u hide your tripod in a bag. the police may think u r a ninja warrior carrying a sword or a asian terrorist with a RPG.