My regular size tripod, 70 cm collapsed (27.6" in Good Christian Units), goes in the suitcase. I had a very long (and carefully subdued) argument with a gate agent insisting that I should check it in (I inflated wildly the price of the strange looking thing and eventually she gave in). So the suitcase it is...
The suitcase gets regularly inspected by the friendly folks that see the strange looking thing in the x-rays. Some are not so friendly, as they cut the TSA approved locks with bolt cutters. One tossed the TSA approved pieces in the interior of the suitcase...
For a photo safari in the Kruger, I bought an inexpensive (and somewhat flimsy) MeFoto measuring 10"+ which fit in the pocket of the medium size duffel bag approved for the trip (by the safari company). Same pocket contained all the things which might look weird in an x-ray screen... (chargers, headlamps, insect repellent, extra batteries (alkaline)).
Most airline regulations require to carry in the cabin laptops, cameras etc for the fear of Li-ion batteries catching fire in the hold. I've never been challenged, but my camera backpack with the 15.4" laptop weighs north of 17 lbs, somewhat more than some airlines allow. My line of defense will be '...but you require me to carry on cameras and laptops...'
Thankfully haven't been challenged yet.
Also, I am getting too old for carrying 18 lbs on my back
, I need a Sherpa. In regular trips, most often I carry only the 60D w. EFS 18-200 and Sigma 8-16, a manageable weight. 