I love proving that a 3–4 day Europe trip doesn't need a cabin case. These are the space-saving things I use to fit everything into one personal item and still bring clothes I actually want to wear.
Sized with budget-airline personal-item limits in mind. It opens like a suitcase, which makes a short trip far easier to pack than a normal top-loading daypack.
Metz 20L Underseat Cabin Bag ♻️ Recycled Fabrics
The cube I would use for tops, underwear and socks. Compression helps, but the real win is being able to lift all the clothing out in one go.
Pack-It® Isolate Compression Cube Set
This stops shirts and smarter bits ending up as one crumpled heap at the bottom of a tiny bag. It also makes repacking between cities much quicker.
Ultralight Garment Folder - Packing Accessory
A toiletry bag that takes up almost no room when it is not full. The roll-top design also makes leaks less stressful.
FlatPak™ Waterproof Toiletry Case - Travel Dopp Kit
Small refillable bottles are much better than carrying half-empty full-size toiletries. Clear labels save the usual shower guessing game.
Travel Containers & Toiletry Bottles | MUJI
Compact enough for a small bag but still useful for a full day of maps, photos and boarding passes. The built-in cable means one less loose lead.
Anker Nano 10000mAh Portable Charger
One small plug can charge a phone, power bank and another device. GaN chargers are the easiest way to cut down the tangle of adapters.
Anker 735 Nano II 65W 3-Port Fast Charger
Two dependable cables cover the hotel room and the day bag. I prefer a longer one for sockets hidden beside beds.
UGREEN USB C to USB C Cable, 100W Charging ...
Much easier to justify than a book when every bit of space matters. The battery easily lasts a short trip.
Kindle Paperwhite 16 GB | Fastest Kindle E-Reader
A proper day bag that packs down ridiculously small. I use this sort of thing when my main bag has to stay within airline limits but I still want something comfortable for exploring.
Sea to Summit Ultra-Sil Ultralight Day Pack 20L
A proper travel towel that packs far smaller than cotton. Handy for hostels, swimming spots or accommodation with questionable towels.
NanoDry™Trek Towel – Small
Collapses as it empties, so it does not permanently steal space from a small bag. I fill it after airport security.
Stow™ 1 liter Collapsible Water Bottle
Personal-item bags can still be weighed at the gate. This is small enough to carry and removes the last-minute repacking panic.
Digital Scale - Go Travel
A low-bulk place for a passport and backup card on travel days. I would keep daily spending money somewhere easier to reach.
Lewis N. Clark RFID Blocking Stash Neck Wallet
Lets me wash a T-shirt or underwear in the sink properly, which is how three outfits can cover a four-day trip without feeling grim.