Haha, a day with just my small baby and without my toddler is my day off. I arrange to see friends or go places or tidy the house.
A baby bag need only contain a couple of nappies, wipes and a spare baby grow. Toddler ones are the same (number of nappies decrease but their size and weight increase so the same really), but with added sippy cups, snacks, plastic dinosaurs, baby reins etc.
My EBF, not that easy (comparatively) baby is much much easier than my easier than average generally polite and pleasant toddler.
When I went clothes shopping with my baby, she slept, I tried on clothes. When I did the same with my toddler, she pressed the emergency button (we were unfortunately in the accessible changing room) and then opened the curtain and ran out into the shop. Whilst I was half way through trying on a bra.
Going to the loo with her in public is a race between me weeing and her opening the door to run out. So I distract her by giving a running commentary...
My toddler is not a horror, or an alien, and she genuinely is wonderful company and I love spending time with her. But even the easiest toddler is still a shed load of effort.
I read this whole thread while boobing my baby to sleep. My husband puts our toddler to bed and it is far, far more tricky and certainly doesn't involve browsing the Internet.
The good thing is that babies turn into toddlers gradually so you have chance to get used to it, and you learn as you go. When you are in the thick of the toddler years you then look back to the immobile babies, whose demands are so simple ( milk, cuddles, not screaming because the imaginary monster won't come for tea).
You'll be fine when you get here.
But baby vs toddler for effort is kind of in pet terms like mouse vs dog.