Tool kits are only nominally portable. Heavy and bulky you really need a vehicle of some sort, even kid's wagon helps, if you have to go very far. That said, a well rounded tool kit is a real leg up in a lot of situations. The ability to repair, patch, perhaps even build rudimentary support systems, water, power and shelter, or get/keep vehicles running can be a huge benefit. Well worth the trouble taken to schlep around tools.

My tool kits vary in packaging but my large one uses a heavy-duty nylon tool bag with a shoulder strap to make hauling a little easier. Inside there are a couple of rolls for the majority of screwdrivers and pliers, and another one for a socket wrench set with sockets on a stick. Tape/s and chemicals go into a zipper bag. As do bulky items with accessories like test equipment. Another heavy canvas zipper bag is set up as an immediate use tool kit with a few frequently used tools like a multi-driver, box cutter, pliers.

These tools are duplicated in the main kit. Getting the most use they are subject to more wear and tear and are most likely to get broken or lost.

Large items, like hammers (claw, framing, small sledge hammers) a tool pouch and belt (Makes larger jobs more efficient), pry bars, and couple of saws all ride in the tool bag.

The combination of tool bag/s, zipper pouches, and tool rolls keep things organized, handy, organized, and well protected. Valuable, the complete set pushes seventy pounds last I checked.