The short answer for a Russian Blue
A Russian Blue needs a carrier that reads as shelter, not display case. This is a reserved, easily startled breed that bonds closely to its own people and finds strangers, noise and open exposure genuinely stressful. Prioritise solid or coverable sides, a top-loading door, quiet fastenings and a stable floor, sized so she can stand, turn and curl fully without crouching.
Why privacy matters more than windows for this breed
A Russian Blue in a carrier is usually scanning for threats. Large mesh panels on every side leave her visible to dogs in a waiting room, passing feet and car-park movement, with nowhere to direct her gaze away. A carrier with solid lower walls and ventilation set higher up lets her settle below the sightline of most activity. A light cover you can drape over the top for the noisiest stretches — a vet waiting room, a station platform — turns the carrier into the den she is looking for. Ventilation still matters: check there are openings on at least two sides so air moves even with a cover resting loosely over part of the top.
Doors, latches and noise
A top door is the single kindest feature for a Russian Blue. At the vet, being lifted upward out of a carrier is far less frightening than being gripped and pulled forward through a front door, and a shy cat who has wedged herself into the back corner cannot be reached through a front opening without a struggle. Look for latches that close with a firm click rather than a clang, and a handle that does not rattle against the shell when carried. Test the whole carrier by carrying it around your home empty: any sway, creak or swinging tells you how it will feel to a noise-sensitive cat at head height in a busy street.
Sizing a Russian Blue correctly
Russian Blues are medium, fine-boned cats, but the plush double coat adds visual bulk that misleads sizing in both directions. Measure the cat, not the coat: nose to tail-base for length, floor to the top of the ears for height, then choose a carrier a little longer than the first measurement so she can stretch out rather than brace. She should be able to sit upright without her ears pressing the roof. Leave room for a folded blanket as bedding — her own blanket, slept on at home, carries the smells that tell a Russian Blue the strange box is hers.
Settling her in before any real journey
A Russian Blue will not accept a carrier that appears only on vet day. Leave the carrier open in a quiet room for at least a week or two before travel, blanket inside, and let her discover it as furniture. Feed a few meals just inside the door, then fully inside with the door open. Close the door for a minute at a time, then lift and carry her across the room, building to a short car ride that ends back home rather than at a clinic. Each calm repetition lowers the chance she arrives already flooded with stress.
Watch-outs on travel day
Watch for a Russian Blue pressed flat and silent at the back of the carrier, panting, or drooling — signs stress has tipped past coping, worth mentioning to the vet when you arrive. Never carry this breed loose in a car or open the carrier in an open space to comfort her; a startled Russian Blue bolts fast and hides hard. If she refuses food for a full day after a stressful trip, or hides and will not come out at home, call your vet for advice. For the paperwork side of these trips, KinsLe's Pet Passport gathers your Russian Blue's vaccination and health records into one packet you can hand over at any clinic or cattery without a scramble.