I have had 2 of the same Targus backpack. I used to have both a 15" Mac Book Pro (2008 and thick) and an 11" Mac Book Air, plus books and stuff.
I love it. Have been using them since 2009
https://www.newegg.com/Product/Product.aspx?Item=18W-000X-000K9&Tpk=18W-000X-000K9
There is metal in the oil, which is never a good sign. Not sure what killed it yet, but it is dead. I'm looking to source a new motor now. Factory rebuilts are in the 12-16k range. Used are in the 9-12k range
Here are some videos I made from this past weekend. Both are only a minute long
Fastest time at an Auto X - Sunday
Someone a bit overzealous at NJMP Thunderbolt