In case you're wondering what I can fit in my Proenza Schouler PS11 clutch:
A mini iPad
Celine Audrey sunglasses
NARS Pure Matte lipstick (Madere)
Bobbi Brown creamy concealer
Kiehl's lip balm
Chanel No. 5 hand cream
It's not much, since it's just a clutch, but these are the essential items I carry with me ALL the time.