Howdy. After logging 100k miles with a Land's End bag, it's now time for a new laptop bag. I'm considering the Empire Builder but have one question. One thing I really liked about the old bag was the zippers... the bag was split into two main compartments with zippers for each. I could pull all four zippers together and fasten them together with a single luggage lock; which I would do if I had to leave the bag in my hotel room or with the concierge. Can I achieve the same with the Empire Builder? Are the zippers around the main compartment large enough for a luggage lock? Is there any way to secure the front compartment?