Don't have a funnel on hand? Snip off one corner of an envelope to turn it into a makeshift funnel for dried goods.
This photo from the Simple Bites blog pretty much says it all. This won't work too well with liquids, obviously (unless you have a plastic envelope or some other sort of plastic sleeve), but for dry stuff, use an envelope cone in a pinch.
You can also create a funnel out of cone-shaped coffee filter, as EliseBTX suggests on Martha Stewart.
20 Simple and Practical Kitchen Hacks for Everyday Cooks [Simple Bites]