I recently joined a busy bag exchange with some home daycare providers. It inspired me to go nuts and make a bunch for my little guys!
A bag- You can use a baggy, or a bucket, or even put them in a binder. I store mine in bags but put them out on trays.
Containers with lids- Mine are travel sized from the dollar store and some from my Tupperware collection.
(NOTE: the lids on some of them are very small and can be a choking hazard- not generally for children under 3. With my little guys I sat with them to do the activity to ensure nothing went in or near the mouth. ALWAYS PROVIDE FULL SUPERVISION.)
Learning aspects: (Everyone will have a different experience with every activity- everyone learns at their own pace and in their own way.)
Matching the right sizes, fine motor- screwing/clicking them on and off, fine motor- opening the tops and pressing the spray button, trial and error….