When these arrived, I thought I had ordered the wrong size. They looked huge. I bought them to protect my Brussels sprouts from cabbage moth damage and larval infestation, after the seedlings outgrew the sizes I'd ordered early in the season. They looked almost comical. Now, weeks later, the br'outs have filled the bags. I must not have secured the openings tightly enough, because early on I found cabbage moths fluttering inside the bags, but it was easy to squish them since they were trapped at the top. Since then, no more moths, and I don't see any larvae or damage. Next year I will buy more and and make sure I seal them more tightly. The bags seem to be designed for keeping birds and critters out of small fruit trees, so I can't fault them for letting in the moths. They are sturdy and well made, and the mesh is definitely fine enough to keep out insects. The size allows the plants to grow pretty freely without being cramped.