https://financialpreparedness.substack.com/p/another-bank-tanks
In conclusion, as this graphic of the Great Financial Crisis shows (zoom in), a banking/ financial crisis can take a number of months to play out, though I think the next one will happen much faster due to significantly greater debt/leverage, moral hazard, complexity, stock valuations (in the U.S.), social contagion, high frequency trading, speed of capital, mistrust of government and institutions, clueless policymakers, rampant inflation, a currency that is increasingly eschewed around the world (the U.S. dollar), a dysfunctional labor market, an (artificial) energy shortage, a failing supply chain, and war (including trade wars). Just like before a major earthquake, there are warning signs. The collapse of First Republic Bank is just a tremor, a warning sign of something much larger to come. Get prepared now.
"dozens or hundreds of pounds"
Even assuming the wildly undervalued silver, 1 dozen pounds is ~4000 in today's USD. A modern phone's weight (IPhone 14, if you are curious), would be equal to ~140, too. I would think that is perfectly reasonable for an average day. I'm more worried about needing/making change, rather than the weight for a day.
When I wrote that I was thinking more in terms of a MadMax event where you carry everything you own with you.