It's HUGE - I misread the package, BUT because it is so large I can probably fit two wreaths in it! The material is on the thinner side but very sturdy in terms of the quality. The zipper and handles also appear to be of a solid quality for the price and I love the label window. 
For a wreath with detail in a crowded attic, a layer of bubble wrap over the top may be helpful in preserving those details from getting crushed by accidentally putting something on top of the bag.