34 weeks tomorrow and have mine ready, but went into PTL at 31 weeks so I was cautious. I didn't plan on packing it til closer to 37 weeks.
Mine is just phone charger, a massage roller ball for my back, toiletries for the shower, hair brush/hair ties, Pj's for after delivery and going home clothes for me/baby. So really wasn't much - probably could have thrown together during labor, lol!