It looks like you're getting some good rides in.
Did the mechanic give you any info on what caused the flat? Typically you check the inside of the tire very carefully to look for anything sharp that might still be embedded, ready to puncture the new tube.
- Gray 2010 carbon WSD road bike, Rivet Independence saddle
- Red hardtail 26" aluminum mountain bike, Bontrager Evoke WSD saddle
- Royal blue 2018 aluminum gravel bike, Rivet Pearl saddle
Gone but not forgotten:
- Silver 2003 aluminum road bike
- Two awesome worn out Juliana saddles