I've got a very gently used Lowepro Lens Trekker 600AW backpack for Pro SLR camera with a lens up to 600mm f/4 lens attached. I used this for one trip to carry a 500 - sold the lens but never sold the bag. I just checked B&H (which is where I got it) - new price is $149.95. I can't compete w/B&H for shipping but I'll sell this for $100.00 which will include ground shipping to the lower 48 States. I'll split the shipping to anywhere outside CONUS.
You can either email me at firstname.lastname@example.org
or PM and we'll discuss payment options. PAYPAL add 3%, check or money order must clear prior to shipping.
Thanks - Don