Reddit reviews Powerextra 4 x Lens Case Lens Pouch Bag with Thick Protective Neoprene Soft Plush Compatible with DSLR Camera Lens (Canon, Nikon, Sony, Olympus, Panasonic,etc) Includes: Small, Medium, Large, X Large

Seconding the Peak Designs recommendation. I have a Sony a6500, so not as heavy as your camera, but with the quick-draw clip I can hike comfortably with the a6500 on my chest-strap.

For lenses I actually take a short telephoto and wide-angle when those kinds of shots present themselves and keep them accessible as well using lens pouches on my belt.

See link below, but basically they are $11 for 4 pouches of various sizes. Felt interior and neoprene exterior for minor padding and water resistance. There are belt-loops and a draw-string enclosure. I slip the waist-strap for my pack through the belt-loop and keep a lens on each side of my hip. Obviously in bad weather I'd take it all off and put it at the top of my pack, but for nice weather it's good to have all 3 lens options open to me without taking my pack off. The solution has worked quite well, just don't trip!

https://www.amazon.com/gp/product/B06XPFV5NQ/ref=s9_acsd_top_hd_bw_bE2TN_c_x_2_w?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=merchandised-search-3&pf_rd_r=4VJK4D6SSVG6YEST9W9E&pf_rd_t=101&pf_rd_p=0f706148-db66-5c2c-a8f5-bee46dedc573&pf_rd_i=3346101

For Kayaking I'd use a cheap and reliable roll top dry bag and put a camera insert inside with some silica gel packs to absorb any moisture.

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1. Waterproof roll top bag - just get one that is large enough for you and has any features you want
   
   1. Example round
      
   2. Example round
      
   3. Example backpack
      
2. Add a camera insert to fit
   
   1. Example using a single insert
      
   2. Example using a separate case for camera
      
   3. Example using a case case for lens
      
3. Silica gel packs
   
   1. Example