The Unbreakable® Umbrella made by real Self-Defence, is the secret agent tool you've been waiting to for. Just as strong as a steel pipe but only weighing between 590g & 822 g (depending on the model). With has no unusual parts, no more metal than an average umbrella, it does not arouse suspicion, can be carried legally everywhere, unlike a walking stick or cane it does not cause strange looks if carried by an able-bodied person, and it even protects against rain! Sadly it won't stop bullets, nor does it spray concussion gas at the twist of the handle.
Available in three models: telescopic, standard, and premium. The main difference between the models is in the frame of the umbrella, which is the structure that holds the fabric open, but they share the same “proprietary composite” core shaft. In other words, all models are equally strong in the whacking department. Apparently it has become standard issue for the Presidential Security Group of the Philippines.
I like the telescopic one the most. Here's the website link: http://real-self-defense.com/