Gulp containers are the worst. Big jar, small jar, pouch... They all leak. Even the Plano jars intended for the liquid soaked Gulp. Leaky, leaky, leaky. I had to get some silicone O-rings to get the Plano jars to stop leaking. I think the last Plano ones I saw had silicone seals so perhaps they've solved it if Berkley hasn't.