While I do depend on public Transport here in the UK, the problem is that it has got really expensive.
If you don't book well in advance online, the tickets cost a fortune. And when more then one person is travelling, it is usually much cheaper to drive, even with UK gas prices
.
On flights I tend to be a bit of a pack rat, as I'm usually going away for a month or so, so tend to carry everything I'll probably need. Being the geek of the family, that means that I have to carry all my troubleshooting equipment
as there's a more then fair chance that I'm going to be called on to fix something.
So while I might carry only a few pairs of clothes, most of my luggage tend to be my backup disks, extra cables, tools etc. And as for my hand luggage, last time I travelled, I ended up carry a reasonably small backpack that still ended up weighed 18kg! (my laptop, 2 HD's with power supply's, my D-SLR, its lenses, a pocket DV camera, chargers, and a partridge in a pear tree
)