If I want to refer to a bag someone is holding, which of the options below is/are grammatically correct?
The bag you are holding (Definitely grammatical but I feel as though the indication the definite article provides isn't as strong compared to that of a determiner like 'this'. Especially when I am right next to the object.)
This bag (that) you are holding (Very clear reference to the bag but sounds slightly awkward to my nonnative ears. It is okay to for a relative clause to follow 'this', 'that', 'these' or 'those')
This bag, which you are holding (the one that I am the most unsure of; on one hand it doesn't sound as akward as the sentence above but on the other hand I had no luckily finding a grammar rule that would clear my uncertainty.)
I didn't really find any convincing usages of 'This....that' but remember hearing it from other people in casual conversations. I would very much appreciate it if you can provide some links as well.