Oh I don't know if I've seen this thread before. I have a Disney "Go" bag that sits ready and packed at home (haven't done it yet, but never know when one may want to pick up and go to Disney!) I took a picture of it when I made it, I don't think much has changed, but when I'm there for the week, I often end up taking some things out, and maybe adding a little....
I use a small mickey diaper bag. Something about the shape of it makes it easy to pack up and it's strap is long enough to wear messenger style.
In the smaller star bag I keep a small tripod, pens, a soap box with band-aids, alcohol wipes etc in it, glasses cleaner and microfiber cloth, a USB wall plug and multiple head USB cord, magicband, small power bank, spare phone battery & a smaller wallet; Then I also have a spare change of clothes, a scarf, poncho, umbrella (though this was a cheapy and broke, I need a new one), book of index cards as a small autograph book, chapstick, sunglasses (prescription), small camera and extra power bank, water bottle and a spare fold up bag for goodies.
when I'm there for the week I usually end up taking out the spare clothes, the lil bag and depending on the forecast the poncho, and add in the small pill bottle I keep in my regular purse. Sometimes need to add in diapers/pull ups for my niece, maybe a few more spare batteries/power banks (my phone is so old it sucks battery in hours) and now I basically use my Figment 35 wristlet for the wallet since I can slip cards, money and my phone in there, and take it on rides etc easy and leave the bag on the stroller.