When to pack for hospital?

Ali • Mom of a perfect little boy!
Ill be 30 weeks on Sunday, hubby and I just had a huge shopping trip and bought a lot of things that's we've been needing for baby but now I'm wondering when I should pack the hospital bags. I don't want to pack too soon but I'm terrified of going into labor early being I've had off and on contractions and BH the whole pregnancy (and an er trip for preterm labor) when have you ladies packed?