Start with the problem.
Most shops assume you already know what you want. This works the other way round — pick what is actually happening in your home, then see which product helps.

Getting to the vet is the hard part
"Taking her to the vet is harder than it should be"
The MTR heavy rail bans pets outright, guide dogs aside. The Light Rail allows them only at weekends and on public holidays, and only in a fully sealed carrier with no head or paws showing. Taxis may legally carry pets, but any driver can refuse you. Before the appointment even starts, transport is the first thing that can go wrong.
What helps

Twin Mesh Window Backpack
Mesh windows on both sides with a cat-face front panel; four colours.

Printed Hand Tote
A soft hand tote in five patterns, with eight vent holes.

Collapsible Window Hand Tote
A large front window on a collapsible body: open it out to carry, flatten it to about 7cm and put it away.

Light Sling Carrier
A single cross-body strap with an open top so your cat can look out; suits cats up to 7.5kg, and you will need a harness to clip the internal safety lock.

Cat-Ear Window Backpack
A large window in a cat-ear shaped body, with two vents at the front and three underneath.

Bubble Window Backpack
Carry on both shoulders and keep your hands free; the bubble window lets your cat see you. Suits cats up to 5kg.

Folding Hand Tote
A soft hand tote that folds down when you are not using it; nine colours.

Detachable Trolley Cat Bag
Wheel it when the walk is long, take the trolley off when it is not.

Wire-Frame Bubble Backpack
The bubble window takes a roll-down sun shade to cut direct heat; the zip locks and there is a safety tether inside — two things stopping an escape.

Hard-Shell Flight Carrier
Hard shell with metal grilles on three sides, S/M/L for different weights, and it comes apart for storage.

Skylight Hard Carrier
A top skylight plus a front metal door, so you do not have to drag your cat out through the front — the vet can reach in from above.

Hand and Shoulder Tote
Carry by hand or on one shoulder, with a fleece bed inside; suits cats up to 6kg.

Luggage-Strap Hand Tote
A back strap that slides over a suitcase handle, so the carrier rides on your luggage instead of your arm.

Folding Tote Bed
A soft tote that lies flat and becomes a bed; 18×11×10.6 inches, rated to 9kg / 20lbs.

Penguin Capsule Backpack
A capsule backpack shaped like a penguin, with twelve vent holes.

Side-Window Feeding Tote
A side window you can feed through, with three ventilated sides and room to spare.

Twin-Chamber Mesh Backpack
Large mesh panels front and side for air, and the back zips open into an extra chamber; folded up it is an ordinary backpack.

Front-Back Expanding Capsule Backpack
A bubble-window capsule backpack with mesh panels that pull out to add space; fits cats and small dogs.

Large Capsule Backpack
Five colours, room to take your cat along for the view; suits cats 5–7kg.

Folding Car Crate
A crate for the back seat that folds flat when the trip is over.