Some milk jugs spray painted black and almost filled with water were placed inside. These will absorb heat during the day and help keep the temperature up overnight. Gardening Jones » How to Build a Mini Greenhouse pt.3
Some good family camping pointers, meal ideas over the grill, smart things to bring, etc. The 3 milk jugs are filled with ice and frozen. Good idea to keep water coming as it melts too to stay hydrated.