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 ^^