When Did Two-Strapping Get Cooler Than One-Strapping?
slate.com
slate.com
I'm amazed at the size of some of the packs kids carry today, and I thought my pack was huge at the time. So, if you've got a much larger pack with significantly more weight, you're going to use both straps.
If I'm correct in my judgement that packs have gotten larger.
Personally, I used to be a messenger bags guy (cooler and more convenient access) but now I need two straps.
As an adult, one-strapping gives me a near-instant headache (I wonder if it always affected me that badly?). Even looking at the photo of Channing Tatum makes me feel uncomfortable.