When I began teaching kindergarten, I muddled with different ways to keep everything organized for two different classes. (Those of you who have always taught full-day kindergarten probably can’t relate!). The secret to my success: I colour code my classes.
I use green for my AM class and blue for my PM class, but you could use any two colours as long as they are readily available. (I use the same system for anecdotal notes and assessments so it is important that I pick colours that paper is also stocked in at my school).

These are our bins for inside shoes. AM students put their shoes in the green bin when they go home and PM students use the blue one.

These bins are our “catch-alls” for handouts (and student work) that need to go home, again green for AM and blue for PM.
In our class we all sit together for snack. Each student hangs their open backpack on the back of their chair and once everyone is settled, I can easily put things directly into each student’s backpack. At our school, we often have notices for the “oldest or only” student from each family. At the beginning of the year (until I have this list memorized), I tie a bright yellow ribbon on each “oldest or only” child’s backpack so that I can efficiently hand out these notices.

The green and blue bins on this shelf are used for students to return their library books (our librarian likes them to stay separate by class).
What is your secret to keeping more than one class organized? Please leave a comment and share.