Another way to look at this, is to ask yourself what your threat model is. For example, if your primary concern is losing your laptop while traveling, then writ

Another way to look at this, is to ask yourself what your threat model is. For example, if your primary concern is losing your laptop while traveling, then writing down your pass phrase and keeping it with other important paperwork (tax returns, property deeds, birth certificate etc) in a home safe or a bank safety deposit box seems totally reasonable. If you have concerns about Protecting your data from law enforcement, then the pass phrase needs to be stored out of the reach of a warrant - a trickier proposition.