+1. My travel setup based on Allett wallets is the following:

• Home everyday wallet, their sport/international model, fits home shop cards and a bit of cash and business cards and a bit more, and receipts, and very thin and small. This is the only thing I carry when at home.
• Travel wallet, their old sport/international model (a bit wider to fit bigger paper money). This holds my most common travel related cards e.g. travel insurance and emergency EUR 50 and USD 100 bills, and photocopy of passport, etc. When I go on a trip, I move only a few items, my usual credit cards and drivers license to this wallet from the everyday one and add any relevant foreign currency if I have some left over from last trip.
• Passport wallet which contains passport (duh), an additional backup credit card and a few status/travel related cards, and additional emergency cash in EUR and USD (my policy is that I always want to have enough cash for "taxi to the airport", so if anything happens, I can start my journey towards home).
• One more standard wallet to keep all the other cards I have, it fits plenty, and stays at home. I keep this at home, just pick up some card (e.g. model rocket club membership card ;-) when needed especially.

By keeping a separate home and travel wallet, it is super quick to move just a few cards and I'm ready to go, keeping the other home/travel related things in each wallet all the time. The passport wallet nicely holds passport and organizes secondary cards.

The Allett wallets keep the cards in safely, as the card pockets open inwards, i.e. when the wallett is folded closed the cards are safely held inside, and in the last few years models a rubbery grippy thing keeps the cards from falling out when the wallet is open for use.

I find the "piles of cards" storage method to work well, you can access 2 cards super quick without looking (top and bottom cards in each pile) and other cards you can slide out with little more effort. So even with the small wallet, 4 cards are super quick to access (2 piles, bottom and top) and fits 4+ more cards.

Note: I'm just a happy customer, since 2007, no other connection to the company. The wallets are very durable, I replaced some of them after 8-10 years and hundreds of thousands of miles in the air, mostly due to looking a little worn out, they still held together well. I only wish they would bring back the slightly taller "sport/internationsl travel wallet" version which fits the bigger paper notes of other countries (should fit at least EUR 50 with some margin), the sport/pocket wallet model today seems to be designed for narrow US paper money.

Bonus: The pocket wallet has a narrow place at the top which fits a small pen (you can get the pen from them), to also carry a pen with me always (can you say filling in a landing card or car rental form ;–). The bigger wallet can also accommodate a thin pen in the center fold inside area.