We do not have a sizing chart for all bags we carry. That chart would be as big as our catalog. (Not really but close). We suggest you take your gear, lay it out on a table and measure. Take that information and match it to the dimensions listed in the specs of the bags that interest you. If you need further assistance, contact us at 800.606.6969 /212.444.6615 or e-mail [email protected].

The weight of the Vanguard Alta Sky 66 Camera Backpack is 5.6 lbs.

Yes the Vanguard Alta Sky 66 Camera Backpack (Dark Gray) should hold the Z9 with 400 2.8FL with adapter and hood attached.

Yes, this bag should just about hold a camera with the 800mm lens. the interior dimension is 24" long, if your set up is within that range, then it will fit.

The basic standard regarding airline carry-on size limits for a bag is a total linear size not exceeding 45 . This means adding the height, width and depth and wanting that number to be 45 or less. The Vanguard Alta Sky 66 Camera Backpack totals 47.2 so technically it is too big and we suggest a smaller bag like the Vanguard Alta Sky 49 Camera Backpack (Dark Gray) B&H # VAALTASKY49. It's listed dimensions add up to 44.9 . The reality is, it depends on the situation. If the flight is not heavily booked, they could let a bigger bag in. Or when it is a fully booked flight, they might look at a smaller bag as too big. As always, check with the airline before your flight.

According to Vanguard, the internal dimensions of the Vanguard Alta Sky 66 Camera Backpack (Dark Gray) is 10 1/4" × 9 1/2" × 24".

Yes, the Nikon Z9 Mirrorless Camera with the Nikon NIKKOR Z 400mm f/2.8 TC VR S Lens attached will fit in the Vanguard Alta Sky 66 Camera Backpack (Dark Gray).