I just started working in field engineering for lab equipment, and I'm trying to pick out the most functional (and coolest) tools organization.

I know one guy with a big bike-bag full of smaller loose tool bags, and one guy with a soft toolbox. I'm thinking I'd like a tool backpack, or possibly some tool rolls.

My tool kit isn't going to need to be super extensive: a bunch of allen wrenches and screw drivers, some pliers and snips, a little bottle of machine oil and a brush, etc.. But I'd like to have some room to expand. It would also be cool to have some modularity. Again, the tool set is basic electronics servicing stuff.

What do you guys think? Again, I want something light and practical, but I'm definitely considering cool-factor too.