Hydroponics kit for a class! Enough items for 60 students to create one hydroponic system or for 30 systems to create two. All items can be composted after the activity is complete. 
60  compostable cups with lid
60 cotton balls
60  brown coffee filters
60 compostable resealable bags
Lettuce seeds  
60 bamboo-based straws
 
Items for project that are not supplied in the kit:
Scissors or utility knives
Nutrient solution (see blog post for nutrient solution recommendations)