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Question: I have a lens that is 15 1/2 inches long will it fit in the back pack on one of the side pouches?
Document: This one fits all your camera equipments. I have a DSLR camera, 2 telephoto lenses, a point and shoot, 4 filters, one wide angle lens, battery charger, spare battery, remote, 2 tripods (one mini, one full size) , tons of manuals - everything fits easily. It has a padded laptop compartment, so will fit your 15 inch laptop easily. I am not sure about 17 inch laptop though. The best part is the waterproofing arrangement it has.
the size is good but the quality is very poor.1)  it said the Recommended Carry Capacity: 20- 55lbs. actually, it broken on the shoulder belt when i just load 15 ponds!2)  then foam support is very lower quality. it is not flexible and strong to hold your lens etc.not recommend this product.
It's affordable also. One of the other pack I found was 2/3sthe size and twice as expensive. The active pack has room for my stuff and the tripod carrier feature is great.Only down side is the laptop compartment is too small for my laptop, but then I have a 17.8 laptop so finding anything that fits my laptop is difficult.
I have had the pack for a while and It is defiantly large enough to hold my camera with two lenses either with a lens attached or both lenses and the body separate. In addition it still has space for a Samsung MX20 camcorder plus all cables and chargers for both cameras. If I have one complaint it is the top strap associated with the tripod holder. I wish it had a buckle instead of a friction system. Some of the older large tripods wont fit to well, but that isn't a big deal.
I just got my Ativ Pak yesterday. From looking at the backpack I must say the quality looks good enough. If you wish to have this backpack I'll give you a heads up. This back can hold quite a bit of equipment inside of it. With it's adjustable parts it makes it easier for me to make sure my lens and camera body fit in properly in the bag. This bag is great for people that don't want one of those bags that has like a camera brand on top of it.
(2)(1) I have a 17 inch laptop (Dell Inspiron E1705 which is kind of thick by today's standards) that barely fits. I say barely because I can get it in, but I fear I will eventually bust the zipper doing so. (2) I don't want to just throw my remote shutter release, card pouches and other small items into a big open pouch. My shoulder bag had the stitched dividers in the pouches that was convenient for storing small items.
reasons to buy this bag..1)ITS CHEAP! 2) its well made. zippers and material are rugged and durable. 3) if you're like me who don't like switching lenses and carry 2 camera bodies with lenses attached. 4) u can carry additional lenses and flashes. 5) u can attach a tripod on its side. 6)  it has a rain cover to protect your camera from the elements.
If I had a higher level of confidence about the padding/dividers capability I'd rate this backpack a 4 star item. In my world, nothing rates 5 stars, which equates to perfect. 4 stars is "pretty darn good", 3 stars is "Exceeds my expectations", 2 stars is "Should have saved my money", 1 star is "where do I go to get my money back"? Overall - not bad.Larry
Canon 60D with vertical grip (lens always off in the bag). Polaroid PL-144AZ flash. 17" MacBook Pro with neoprene sleeve. Canon 50mm f1.4 lens (small and very light). Canon 100mm f2.8 macro (long and a little weighty). Canon 100-400mm f 4.5-5.6l is telephoto (huge and heavy). Manfrotto tripod, fairly heavy (strapped into the dedicated tripod holder on the right side).
I had been looking for a pack like this for a long time. Price wise it is well worth it. It is excellent grafted. With 'pockets' that can be easily re-arranged to fit your equipment. I needed something that would hold 4 cameras and their lenses. This worked out so perfectly.
Answer: Yes, you could configure a side section to fit it.