As mentioned by my Mitrezensenten, can the box without wheels really difficult to move, especially because of their size and bulkiness. Since no normal handle is available, but only the pull-out above the door, you have to individually carry around with both hands in front of each box. For me as a woman a special exhausting endeavor. The roller set can be purchased separately at a disproportionately high rate, if you intend to use the box frequently. For me the purchase price is not worth it, because I still have a pet carrier bag and a small transport cage z. B. for vet visits and even non-planar, unreasonable my cats flights more often.
Shortly for assembly: upper and lower parts are repeatedly verschraubbau stable together, in addition, there are also still lock clips.
Enough air gets the animal through slots in the side and back walls of the upper half.
If the spring clip is really really snapped up and down, accidental or unintentional opening of the door is excluded. Lockable but the cage is not.
Included are two large "Live Animals" label, which does not stick to the boxMaterial. You have to help out with anything other adhesive. But at the airport's eh again conspicuous markings ...
Conclusion: Overall I recommend it, especially for air travel, albeit difficult to tolerate. The decisive factors are the integrity of the animal and the acceptance by the airport staff.