Suitable for light touring?

Hello everyone, I am considering an Outer Hebridean cycle tour next year over 4 to 5 days and plan to travel light (no tent as will use B&B) and eat in pubs/carry local bought food etc. The two questions I have is what would you suggest I use to carry the necessary clothes etc, panniers vs seat pack or frame bag and is my Giant Defy 3 from 2010 be suitable in terms of weight chatting capacity https://www.giant-bicycles.com/gb/defy-3-2010? I weigh around 85kg.
All advice welcome.
All advice welcome.
0
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I'd look at this or a frame bag - Altura Arran Expanding Post Pack
Just check that it has rack mounts.
https://www.dropbox.com/s/p2xeixgt2at72ai/DSC00209.JPG?dl=0