Sensory Bags Me and my son had so much fun making these sensory bags. The materials we used were: Ziplock bags Foam letters Bugs Hair Gel Hot glue gun I originally used a gallon size ziplock bag but I only had one bottle of hair gel. While trying to move the gel and letters to a smaller ziplock bag it got really messy and my son really enjoyed it. If I did it over I will buy more hair gel in a variety of colors.