Yeah good idea, I used to do that but don't see the hook on many tripods these days. Is it an extra you need to get?It can, that's why if it's windy I just hang my pack from the hook on the bottom of the center column.
I went to my local store today to play around with some tripods. Manfrotto just feels cheaply made these days. My two favourites were the MoFOTO Roadtrip Carbon Fibre and the SIRUI A1205. 3.1lb and 2.6lb respectively with a relatively nice ball head.
@Phocal have you tried the MoTOTO Roadtrip S version too? Doesn't seem to be too much difference in spec, but 1/2 the price.