I'd not bother with breast pads. Your milk won't come in for about 3 days, hopefully you'll be home then!
I had 3 bags - a small bag for labour (straw, energy sweets, cereal bars, phone, one outfit and nappy, knickers with pad in, wash stuff, flip flops and hand towel)
Main bag in case I went to the ward (knickers, pads, pyjamas, towel, baby clothes, cereal bars, phone charger)
Changing bag (idea from someone on here - if you have complications/epidural/spinal or CS, you can put the changing bag within reach rather than having to ask someone to get nappies/wipes out of your main bag)
The changing bag and main bag can stay in the car, take the labour bag in with you to the hospital. If you're at home, you know where everything is (no directing DP/DH to find stuff) and it's ready to go if you need to transfer in!