Tumi Luggage T-Tech Network Soft Carry-On

This is an awesome piece of luggage. It's big enough for weekend trips, short business trips, and as a second carry-on bag (it snugly attaches to rolling bag handles, keeping it from slipping/spinning when you have to the race to the gate) for squeezing under the airline seat in front of you while you place the larger rolling bag is stored above. It has many useful zippered and open sections and pockets for quick gear access, folio, paperwork, 15" slim notebook (my MacBook Pro fits) etc.

Packing cubes and and a Pack-it folder for business dress clothes will help maximize the interior space in main compartment while also making packing and unpacking a breeze. Shoes will take up a lot of the internal space if bringing a second pair. I also recommend using as small of a toiletry bag as you can get by with if you are using this as your primary or only piece of luggage.