Take this for what it's worth. Mom's panel is sometimes inaccurate:
https://disneyparksmomspanel.disney...ave-stroller-recommend-getting-locker-114061/
"
The way you'll deal with your bag varies a bit from ride to ride. Here are some examples:
- Wear the bag or keep the bag on the seat next to you or on the floor in front of you: Haunted Mansion, Toy Story Mania, Buzz Lightyear, the vast majority of others.
- Use a dedicated bin in your ride vehicle for personal effects: Soarin', Mission Space, Kali River Rapids.
- Put the bag on the floor in front of you with a foot through the straps: Expedition Everest, Rock 'n Roller Coaster, Space Mountain."