Simon Says
Cathode Follower
Easy, it'e Xotic EP Booster. I was using one since they came out. Every time I'm thinking to drop it its finding its way back on my pedalboard.
Alternatively - my tuner. I'm not really brand loyal but I have Sonic Research ST-300 mini right now.
I have few other solid choices gear wise such as Kingtone Octaland Mini for all octafuzz needs or either Boss DM2 or DM3 (to me they sound the same) but I can live without them.
I need to retract this.
One single piece of gear right now I would really had to recover from lost would be Chase Tone Secret Preamp. This thing is always on and makes everything better