I want to list a bag, but i can't find the description of the bag anywhere online. what should I do?
The make, model, manufacturer, and size of the bag in question?
^^^YES
Well, I have to tell you that descriptions posted on the internet at retail sites are copyrighted material and therefore not yours to cut and paste. eBay will pull a listing for that. Same with descriptions copied from other eBay sellers.
I recommend that you just measure the bag yourself and describe it as well as you possibly can. The truth is that for most buyers the pictures really tell the story, and half of them don't even read the listing anyway!
Good luck.