Bought this for my daughter for back to school. Had a strong chemical smell at first, probably due to the manufacturing process.  I opened all the zippers and let it air out a couple days before use, and the smell went away.  The backpack looks really nice.  But after one month of school, the wheel broke off.  Seller does not give returns on used items, or returns after 30 days (must be in new condition).  Then I went to the J World website.  They have a 12 month warranty, but you have to pay for shipping on your end (about $10), and send J World check for $14.95 for the shipping on there end.  So that would cost me about $25 to return this.  Also, they said it has to be a manufacturer's defect, not any kind of abuse.  So there was a risk that I send it in and they say my daughter abused it and broke the wheel off.  Also, you need the warranty card, and my backpack didn't have a warranty card, I only had the receipt.  So basically I have to eat this one.  Not happy at all with this purchase.  Also, my daughter has a light amount of weight in the bag, wheels it on a smooth and even sidewalk, and everything is one one level (no stairs).  I know she doesn't abuse it, because I take her to school and pick her up, and walk her in and out.  It is definately not abused or banged around, just poor quality.  When you look at how the wheel is attached, it is attached with a small 1/2 inch piece of cheap plastic.