Cat carriers come in several styles, including shoulder or tote bags, crossbody sling carriers, backpack or bike-basket styles, and soft-sided tote/booster-seat designs made for car use.
Many carriers include mesh panels, ventilated holes, or adjustable open-hole designs so pets get airflow and can see out; some specifically list ventilated mesh tops or mesh windows for extra airflow and visibility.
Assembly requirements vary: some carriers list 'Adult Assembly Required' and include tools, while many soft-sided carriers and bike/basket styles require no assembly or install in minutes without tools (for example, a quick handlebar mounting set-up).
Several soft carriers include padded interiors, removable faux-shearling beds, or cushioned bases to provide a cozy, comfortable space that helps pets settle during travel.
Listed carrier weights tend to be lightweight: small fabric carriers often weigh about 0.52–0.6 pounds, while several soft-sided travel or bike-style carriers are around 1 pound.