Just curious as to what backpack/bag you wildlife and birders use. I have the Sigma 150-600 paired with the 7dii and am trying to come up with a great pack for it along with my other gear, see below. I have been using either my Mystery Ranch Metcalf (hunting backpack) or my Deuter 6400 backpacking pack. None of these have padded compartments of course so it takes a bit of finesse to get them in without a lot of movement, i.e., towels, coats, etc.... Thanks in advance, Cole

