Water beads

Water beads or water crystals , also known as water gel or crystal soil or jelly ball, is an odourless super water absorbent polymer.
The polymer acts as a reservoir of water and the crystals hold more than 100 times their dry volume in water which can be a long lasting water source for plants. A single 5 grams packet of water crystals expands to fill over 1000ml.

You can actually layer the beads according to their colors.
I mix them all... pretty cool actually.

Love the random colors