The gel packets absorb moisture and hold water vapour from the air. EXPERT SAYS: 'Silica gel will certainly dry water droplets. This will. Dry - packs moisture absorbing indicating silica gel packets item number dp includes 5 of the indicating silica gel packets that have indicating crystals inside. Dry - Packs Moisture Absorbing Indicating Silica Gel Packets item number DP includes 20 of the Indicating Silica Gel Packets that have indicating crystals.