Military Duffel Bag
I snapped this pic of my Dad's old military duffel bag on my last visit home. I love this type of top load duffle. We've used this bag for years and though its taken a beating, its held up well. You can attribute this to lack of stress points. You can cram these things full and never worry about busting a zipper.
One of my favorite parts is you can still see the Delta Airlines luggage tag from when he flew back to Macon, GA in 1971. This bag is really inspiring to me for a number of reasons. I hope to do an updated version of it soon.