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For full context, see here:
<https://www.docdroid.net/bv19a5D/img-20170817-0001-new.pdf> It is in the very
first 5 lines (paragraph 1, example)

それでしたら、こちらのがよろしいんじゃないでしょうか。

I guess the customer simply agrees to buy the recommended bag, but this time I
wanted to ask what exactly this huge appendix ...じゃないでしょうか means. It probably
is some kind of reaffirmation, I'd like to have some more information on this
^^
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2017-08-17T07:17:43.663
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question
expressions
What does this phrase mean?
It's a form of a question that elicits some form of confirmation.

> お寿司は日本の代表的な料理だと言えるんじゃないでしょうか。  
> Sushi is the delicacy that best represents Japan, wouldn't you say?

You may not have the full proof to back up the statement you are posing and
hence you are seeking some form of confirmation from your listener/reader.
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2017-08-17T09:32:21.993
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> それでしたら、こちらのがよろしいん **じゃないでしょうか** 。

I would interpret "それでしたら" as "それがお好{す}きなら/それがお好｛この｝みでしたら" or
"そのようなものがお好｛す｝きなら/そのようなものがお好｛この｝みでしたら", then the part will be interpreted into
like "If your preference is like that".

The huge appendix is changed gradually as:

  1. こちらのがよろしい **ん** じゃないでしょうか。euphonic change from 1 to 2 
  2. こちらの方がよろしい **の** じゃないでしょうか。  
こちらの方がよろしいの **じゃ** ないでしょうか。euphonic change from 2 to 3

  3. こちらの方がよろしいの **では** ないでしょうか。  
こちらの方がよろしいのではない **でしょうか** 。 polite form 3 to normal form 4

  4. こちらの方がよろしいのではない **か** 。  
= こちらの方がよろしい + **の** + ではないか (let's do (something) )。  
**の** in 4 is a particle used to nominalizes verbs and adjectives​

The whole sentence will be like:  
_If your preference is like that, I think that this one is better, don't you
think so?_
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2017-08-17T11:01:35.453
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