Slick
Guru
As others have indicated, the key to long commutes is to leave everything you can at work. Not just clothes; washing kit, towel, locks, spare tubes/tyres, pump, tools...etc.
Can you pick up your stuff from work and take it to the gym?
You really don’t want weight for these rides, do everything you can to avoid carrying stuff at all, but if you have to - panniers.
Wrap all your clothes in a plastic bag before you put them in the pannier. And figure out what you’ll do that inevitable day when you arrive with your clothes soaked, or the pants missing.
Good advice there, no matter how organised you think you are, you're going to spend at least one day a year commando.
