Examples of three silica gel sachets. Left: partial-indicating silica gel, with instructions for interpretation. Center: partial-indicating silica gel, no instructions for interpretation. Both sachets (left and center) are packed in a transparent but vapor-impermeable plastic preventing uptake of humidity. Right: vapor-permeable sachet with inspection window. Note warning message written in multiple languages – mandatory in CE-marked products - (sachet at the left) and the pictogram “Do not eat” (all three sachets) which is not clear on the sachet at the right.