Double shoulder or full side

[ewayne53]

Generally speaking which is better grade of leather a double shoulder or a full side? I want to make a duffle bag and I’d like to use better leather. I know leather from one company is better than from another etc. 

[Stewey]

Is it big enough?
The belly is generally the weakest/stretchiest part. The spine the  best part - when it comes to harness leather.
If you need length, a double-shoulder might not have it.
Figure out the total area you need, and then get the piece that will fulfil your requirements.

 

[JLSleather]

As a rule, the butt is the firmest part of the hide (all else equal).  But if it's large enough, the double shoulder would make a perfectly good duffel.  Unless the duffel bag is quite large, i would think the main consideration would be the look desired.  

A double shoulder is going to have natural fat wrinkles running in line with the longer measurement, if that matters.  With a bit of planning, this can be an advantage ...

[ewayne53]

The duffle bag is 20x10x10 for my wife to carry all her products and electrical devices when we travel. So it sounds like a double shoulder is the way to go.