Price police input requested: D3300/extras

Well, alright. I got a D3300 a year ago, picked out a few things to go with it, and I've really loved having it. However, I've realized it's impractical, or at least annoying to pack it around, especially deep into the mountains skiing, backpacking etc. it's actually the single heaviest thing in my pack. I'm considering going mirrorless, and will likely be selling the Nikon.
It's been in a silicone cover its whole life, the included lense is a Sigma 18-200 with a polarizer, a few 16 gig cards, two batteries/charger, and a Clic Elite chest mount bag that can be setup quick release on a pack. I don't recall the number of activations. I'd say it's in great shape. Ballpark price?

Also, I'd be interested to hear what the collective recommends in a smaller package to replace it. I'd like some manual control, good battery life and some zoom. I don't want to give up and just buy a point and shoot, still want to play around with exposure, etc. Budget of 200-350$, used is fine. Ideas?
And thanks.