I like keeping all of my gear inside of my pack in separate bags, most are waterproof, keeps my stuff organized and dry.
Pack cover as well, the last thing I want is a totally soaked pack and lugging more weight. Last section hike it rained for 6 days in a row in Vermont, no views which was a bummer..............but my gear stayed pretty dry.
I am at about 30-32 lbs all in, the weight of these bags is negligible and for me, worth it...........