I keep weighty coins to a minimum by using them in self-service machines inserting the smallest value coins first. I like contactless, but it generates a lot of unnecessary paper - first, I have to collect the paper receipts, and then tick them off against my paper bank statement. (I’m sure I would never bother to check my bank statements if they were only online.). However I know I need to keep paper statements for a lifetime in case there are any more mis-selling scandals, etc. Actually, there’s a lot of sense to just using a few coins to buy a coffee, and then forgetting about it, instead of preserving the memory for the rest of my life.