What size sling should I opt for?

Considering an Everyday Sling but unsure which size to go for between 3L or 6L. Here’s my average carry, hopefully someone can make a suggestion:

  • Fujifilm X100VI + spare batteries
  • 3 Diapers
  • Childs sippy cup
  • Pack of wetwipes
  • Wallet
  • Keys
  • iPhone 15 Pro Max

I’m hoping to go for the 3L but thinking that the baby supplies will push me to the 6L at least.