I usually pick one up each time I am Target. They come in various sizes, and I usually get this size and larger size. A couple of reasons I love these are they store quite a bit and stack nicely.
The above picture are the ones I am currently not using, so they are on top of a cabinet and bookshelf (and yes, my beautiful wood paneling). You can see a larger one for my penguin tub activities. I have some penguin figurines, so that is a time the larger ones come in handy. I usually keep the ones I am currently using or getting ready to use by my prep area. The labels on there came from Katie Mense (and they are free). She includes a blank one, so I have made some that are catered to my needs. I laminate them and then add a velcro circle to the back. The velcro enables me to change them easily if need be. Here is a box filled and ready to store.
In my storage containers I keep the laminated pieces, task cards, seasonal game markers (if any) and masters of any recording sheets. When the kids are using the activities, I just put them in regular shoebox sized tubs (I have a gazillion of them).
There is nothing special about these. The labels have velcro, so I just change the label each day. I have tried cute fancy bins for the kids, but they just don't stay that way. These work great and store nicely on my cubbies when they are not being used. I also have a back storage area with a large cupboard I put my math supplies in. I am in the process of changing this area over to these bins as well.
The math area is still a work in progress. Hopefully this summer I can finish it up. That is quick summary of how I use these. How do you store your center or tub activities when you are not using them? Do you have a favorite storage bin that you have found? Share in the comments below.