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@GA2G
Courier bags are traditionally a one-strap affair. It means that for courier-work, you can swing the bag around your body to take out or put in packages, without unstrapping, or taking off from your body.
Some Courier bags use twin straps (Ortlieb Messenger Pro) like backpacks, and quite a few offer stabalising straps, to stop it sliding on the rider's back. These have the twin strap design in common with backpacks. The main differences are the materials used for true Courier bags is extremely tough. Designed to be seriously abused, and still work reliably for many years.
My Timbuk2 is 17 years old, and has been in constant use; including real courier use from 1991-1994. Such bags are tough. Backpacks are not normally designed with such hard-wearing materials, and don't normally last as long.
The better Courier bags, are handmade, and can me completely personalised.