Easy top-loading, mesh opening with triple closures: double-zippers, a velcro end closure, and a security clip (my kitty could poke his head through the velcro, so this clip was essential!). In addition, a built-in leash lets you clip the carrier to the pet's harness/collar, if it is a real escape artist! Three dual-layer mesh windows let your pet to see out, as well as provide great ventilation. Removeable, plasticized, padded tray for comfort and easy cleaning. External zippered pocket for treats, paperwork, etc. Removable padded shoulder strap. Measures roughly 16"L x 7"W x 10"H; tray is about 1.5" deep. To give you an idea, it easily fit our 11 lb cat. In very good condition.