First and foremost, the carrier must provide uncompromised durability and structural integrity. Agility competition venues often involve uneven surfaces, gravel parking lots, concrete floors, and crowded expo halls. A flimsy carrier that wobbles or collapses under pressure not only risks damaging your gear but also endangers your dog. In 2026, the best rolling pet carriers use reinforced aluminum frames combined with high density polyethylene panels that can withstand repeated loading and unloading. Look for carriers that have passed drop tests and weight capacity certifications. VnioLife, for example, designs its carriers with aircraft grade aluminum extrusions and double stitched seams, ensuring the structure remains rigid even after hundreds of competition trips. Without a solid frame, no other feature matters, because safety and longevity start from the bones of the carrier.