Good question @ameliawheat. I guess I'd start by saying that one crisis isnt the same as the next. If you knew exactly what to prepare for it'd be much easier to tune the prep.

In a geneic crisis however, wealth is not the top priority. Water, shelter, food. Ticking these basics would be the first consideration for a go-bag. I'd suggest a roll of toilet paper too. Would help greatly with morale and doubles for fire lighting support. A small knife and then gold & silver I'd say. Resilient to the elements and identifiable. In the army there's a saying "travel light, freeze at night". Don't weigh yourself down too much.

It's a broad topic. Having some wealth stored either electronically or physically in a different country can mitigate the need to decide what to grab and go with.

As a side note, having horses is both great for fuel free transport and for a reliable alarm system for day and night!