Trace the lid path, adhere closed-cell foam or food-safe silicone rope, and aim for 10–20 percent compression when closed. Avoid gaps at hinges or clasps, and test with a paper strip to verify consistent drag. Replace worn material promptly to prevent invisible leaks over time.
Install two or more toggle latches opposite hinges so pressure distributes evenly around the seal. Consider a simple hasp with a carabiner for curious paws. Keep hardware low-profile to deny chewing leverage, and add washers inside thin walls to spread loads without warping.