Small and light canisters each contain 40g of silica gel. There are rechargeable for many years use. This should be for your camera bag or backpack. Moisture can immediately destroy the camera lens. Silica gel desiccant canisters can save you thousands of dollars by protecting your valuable cameras and lenses. I gave four stars because reading the color change from orange to green in the indicator window can be difficult. You must be a resident of a humid region of the country.
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