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I found these sponges in a 4-pack at Target for $1.99 (about 50 cents each).

I found these sponges in a 4-pack at Target for $1.99 (about 50 cents each).

Look at all the pretty colors. My students will love these!

Look at all the pretty colors. My students will love these!

I found these food storage containers in a 5-pack for $2.19 (less than 50 cents each). Make sure you buy a kind with tight-fitting lids.

I found these food storage containers in a 5-pack for $2.19 (less than 50 cents each). Make sure you buy a kind with tight-fitting lids.

It's fantastic that these sponges fit these containers perfectly. I found them both at Target. No trimming necessary!

It's fantastic that these sponges fit these containers perfectly. I found them both at Target. No trimming necessary!

Here are a dozen containers ready for glue.

Cover the bottom of each container with white glue, and lay a damp sponge on top of the glue.

Cover the bottom of each container with white glue, and lay a damp sponge on top of the glue.

Pour another layer of glue over the top of the damp sponge, and replace the tight-fitting lid.

Pour another layer of glue over the top of the damp sponge, and replace the tight-fitting lid.

Allow the sponges to sit for a few days, so that the glue can soak in.

Allow the sponges to sit for a few days, so that the glue can soak in.

Before storing, mist the glue sponges lightly with a spray bottle. Keeping them damp (not wet) will make them last a long time.

Before storing, mist the glue sponges lightly with a spray bottle. Keeping them damp (not wet) will make them last a long time.

  • 1.0 4-pack anti-bacterial, handy size sponges
  • 1.0 Multi-pack of small plastic containers with lids
  • White glue
  • 1.0 Plastic spray bottle