What do you do when you’re away from your pump for a few hours?

Whenever I have a wedding, date night, or know I’ll be away from my pump for a few hours, I always get to that point where I’m uncomfortably full and start leaking. Nursing pads catch the leaks, but I hate feeling like I’m just wasting precious milk. I’ve looked at milk collectors, but they all seem bulky under normal clothes.Is there another option I’m missing? What do you all do?