This article has some really useful information about what types of donations are most useful for food banks.
What Food Banks Need Most (And What They Get Too Much Of)
There are some surprising (to me) ideas in here, like spices and reusable shopping bags, but they make sense when you think about it.
And if you can’t get to a food bank yourself, check if your local supermarket either collects donations or creates pre-packed bags that you can add to your order and leave for them.