I live out of an A5 Filofax Malden for work, which I primarily use instead of another notebook option since I can usually get a pack of A5 paper off of amazon for not too much to use for both specialized inserts and blank sheets. It works for me, though I use my google calendar for managing my schedule and google/cell for contacts.
Additionally, I use an epi PM ring agenda as my wallet. It works out really well for me, just with adding an extra card sleeve, zip sleeve for receipts/ephemera, and an extra top open sleeve for whatever. For my everyday carry I keep the rest of it filled with blank sheets and my vax card and bandaids in the back pocket. I also have a taiga PM ring agenda with a similar setup that I use as a travel wallet, as it fits my passport/vax card/global card in the back, and when I'm not traveling, I store my other "vital" cards in it, such as my SS card and extra credit cards, so I know where to find them when I do need them.
Additionally, I use an epi PM ring agenda as my wallet. It works out really well for me, just with adding an extra card sleeve, zip sleeve for receipts/ephemera, and an extra top open sleeve for whatever. For my everyday carry I keep the rest of it filled with blank sheets and my vax card and bandaids in the back pocket. I also have a taiga PM ring agenda with a similar setup that I use as a travel wallet, as it fits my passport/vax card/global card in the back, and when I'm not traveling, I store my other "vital" cards in it, such as my SS card and extra credit cards, so I know where to find them when I do need them.