Sometimes I see people bringing a whole load of bags and baskets for their baby. Yes. For a little baby, they sure make A LOT of fuss. But I carried only ONE backpack to go. Don't believe me? Well, this was what I had in my bag.
This was the bag I used quite thoroughly.
1 Packet of Wastepaper Basket Sized Garbage Bags
1 Wet Tissues (Big)
1 Baby Power (Small)
1 Baby Lotion (Small)
1 Baby Bath (Small)
1 Baby Shampoo (Small)
1 Comb (Small)
1 Towel (Thinnest and most ROLLable you can find)
1 Pair of Socks
1 Bottle Brush (The 2-in-1 with teat brush on one stick)
1 Drinking Bottle
1 Milk Bottle
1 Milk Container Bottle
1 Pegion Baby Bottle/Teat Cleaning Liquid (Small)
All this in the list, was sufficient when I went town hopping with my little boy when he was small. So I'm sure it would do the same for you.