Features: - Safe, Non Toxic - Reusable, Can be used repeatedly - Multifunction, For hot and cold usage - Long Lasting! For 500g: Up to 8-10hours (For Cold) & up to 4hours (For Hot). Use with GabaG thermal bag, for longer up to 16-20hours!???? For 200g: : Up to 4-5hours (For Cold) & up to 2hours (For Hot). - Thick Packaging, High durability