Once you add a rear rack, a water bottle, a lock and cable, maybe a basket and a tool kit the weight of the bike will skyrocket. My 23 lb commuter can get to 36 pounds in a heartbeat if I need everything for a big store trip. The you get to add your load......you've already listed a laptop. If you pick-up a 2ltr soft drink on the way home, that's another five pounds.
I didn't need a lot at the store last week so I only took one basket. I came the long way because it was a nice day and there is a horrible hill that I'm working on getting better at climbing. It was exceptionally hard so I weight the bike and load when I got home--47 pounds.
This is with a "23 pound" bike.