As for fitting things in a saddle bag - that does not happen!
This does though....
The panniers always hold locks, first aid kit (plasters, wipes, germoline, insect bite), baby wipes and a roll of bags plus in winter waterproofs for 3, pump,
My basket has emergency pennies, radar key, pencil, pen, paper, camera, phone, and all sorts of spurious items to do things like repair a crabbing line oh and something to eat
"Little" the trailer has been replaced with this vvv now and is currently filled with buckets, spades, crabbing nets, crabbing lines, swim wear, 2 towels, a picnic rug, sandals.....
These are the "Basics" but they get added to with a picnic, piles of shells, balls, bats, drinks, school projects, and a myriad of other small people items!