The human brain is a strange thing. You'd think that something with over a 100 billion neurons would be capable of remembering a few important items that you are meant to take with you on your journey. Or even one.
And, of course, it can. And it does. However, my brain (and I suspect I'm not alone here) tends to wait until I have not only embarked on a journey, but have travelled a significant distance before moving it from the 'stored' to the '!!@£*?!' area of my consciousness.
I'm sure there are all sorts of very clever ways of becoming more conscious of the 'stored' area. However, the lazy way is to put the thing you need to take with you somewhere where you can't avoid noticing it before leaving your house.
Alternatively, put it in the bag you will take with you, or the vehicle that you're going to use.
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