Any how you carry a laptop on one shoulder it won't be that comfortable!! That said, i love the Longchamp NYLON bags. I borrowed my mom's for a year to carry breast pump accessories back and forth to work and I was sold! It really can fit a lot, water resistant, and it looks really classy. Timeless brand of course.
For work, black is of course a default. But i love the colors they do offer if you think one will work for you. Tan, red or orange could work too, and would be more casual.
Here's a pink one for example:
https://www.nordstromrack.com/s/longchamp-le-pliage-expandable-tote-nordstrom-exclusive/7503010