Tips
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Avoid over-soaking: don't leave it in water until it is too swollen. If this happens, don't worry; The insulin will be easier to get out in a short time.
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Limit sun exposure: Do not expose the case to direct sunlight for long periods.
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Periodic checks: Check the case regularly to ensure it stays adequately hydrated.
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Proper storage: store the case in a cool, dry place when not in use.
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Cleaning the outer case: Simply wipe it with a damp cloth and let it dry. The wallet should not be put in the washing machine or dryer.