This product is described as "manufacturer...
This product is described as "manufacturer defect" and warranty also says "defects". What is wrong with this item?
I believe that is a typo. Whoever set up this page mis-wrote the specs area...
The recommended use should be for Ultralight packing (not ultralight manufacturer defect).
The Manufacturer Warranty is lifetime for manufacturer defect--that will cover any issue you have with the product that is due to manufacturing error (zipper stops working; velcro coming off the bag, etc...) which isn't due to use.
So there is no manufacturer defect with this bag. Sorry about the confusion!