First off this bag is way bigger than i expected it to be, but i just managed to get all my equipment inside.The bag is very spacious with plenty of dividers/options for storing bits'n'bobs. There are numerous points on the outside of the bag to connect other pieces of equipment and the two straps included are very handy for holding my tripod, which has it own little carry cup included in one of the zip compartments. Not had it out in the rain yet so can't comment on the water repellency bit if it does get a little moist out i can always pop on the included rain cover that is stowed away in its own little zip compartment on the bottom on the bag.So glad i purchased this bag over the 350 as i don't think i would have managed to get all my stuff into it, i managed to get DSLR body with 300mm F4 IS attached, 70-200 F4 IS, 50mm prime, 18-135mm IS, 55-250, 1.4 converter, 2x converter, 3D leafy camo suit and rain sleeve for 300mm all in the main compartment, still room for more.Overall happy with this backpack.*update* 07/10/2020Had this backpack for a couple weeks now and have been out with it a lot, it is very comfortable to wear/carry, has more than enough room for all i need to carry. I purchased another lens Sigma 150-600mm and can confirm that it fits in no problem with a few inches to spare.So glad i did a little reasearch before purchasing a larger bag/backpack as this one ticks all the boxes for me and will probably be my camera bag from now on.*update* 22/01/2021I have upgraded my camera body to a 1DX Mk II and this with the Sigma 150-600mm fits no problems at all, so now have 1DX Mk II with Sigma 150-600mm attached. 300mm F4 IS, 70-200 F4 IS, 50mm prime, 1.4 converter, 2x converter, 3D leafy camo suit, rain sleeve for 300mm and 150-600mm, 2 scrim nets and strap all in the main compartment, still room for more, i can get some sandwiches and other small snacks in as well, i carry my tripod on the side utilising the two straps provided, a 1 Ltr flask/bottle of water in the side pocket, in the main front zip compartment used for tablet/laptop i have my 16" Macbookpro and some related cables.Still glad i bought this bag over others as i am still extremely happy with it.

I bought this for my sigma 150-600mm lens purely to protect it. To be honest I was astounded at the price, very expensive for a protective filter but I didn't want a cheap filter on such an expensive lens.

Excellent tripod used this with my cannon 650d and a 150-600mm sigma lens on it . Very happy with it

Just received 2X UV filter for protection of my Tamron 150-600mm lens. I have had lens for many years and a very poor UV filter was previously on the lens. This new filter seems to be well made and with use of a filter removal tool should be very easy to remove if needed. Would recommend this filter.

Solid build, just what I need to hold a 150-600mm lens firmly.

Sony 200-600mm w RRS lens foot fits perfectly into the SK-100, which fits perfectly with the RRS BH55 ball head & tripod. Easy to set up and use immediately.

For only $150, you get a very high quality portrait lens (it even has a metal mount). The difference between this one and the f/1.4 does not look to be worth getting the 1.4

I bought this camera strap to hold my Tamron 150-600mm lens. While in the field it works grate for carrying the camera and lens.