Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: what does 16L or 22L mean???
Document: )* Stylish - get lots of comments especially when I pull out the cameraI first bought the 22L model in blue, but found it too big and too blue. I'm 5'11" and 170 pounds, and it didn't look like a daypack on me. I returned it and ordered the 16L in Gray and couldn't be happier - I use my SLR much more than before. Excellent product.
Great looking bag with awesome functionality. Would definitely recommend the larger, 22L for bigger dslr cameras as this barely fits my D800 with a lens.
Bought this for my Wife, although she hasn't actually used it yet. The LowePro Hatchback 16L appears to be PERFECT for her needs in every sense...EXCEPT...for being just a bit small. The next size up would have been too big for my wife. maybe an 18L would have been PERFECT!! !
It's not a giant of a backpack, which will make it ideal for day trips as well as longer travels. Toughness "on the road" has not been tested yet, but as it's a Lowepro I expect no problems there. The only drawback is the size of it's camera compartment, as it will definitly not accommodate any additional lenses. It's bigger brother, the 22L model, will probably do better in this respect, but the increased size does qualify it as a large backpack.
In my never-ending quest for the ultimate photo backpack, I recently came across this new Lowepro Hatchback. It attracted my attention with it's combination of lightweight materials, sleek design and modest size (at least for the 16 liter model). I was looking for a small to medium-sized daypack with good ergonomics, and so I thought the Hatchback 16L would fit the bill nicely.First things first: the Pepper Red definitly isn't red!
It has 2 elastic mesh pockets and 1 zippered compartment. These are useful for smaller items such as keys, filters, cables, etc. A water bottle can go into 1 of the 2 outside mesh pockets, and the front pocket is useful for flat items such as books, newspapers or a tablet PC. There are no dedicated tripod attachments, although you could put a compact model in one of the side mesh pockets.Overall, I think the Hatchback 16L is a well-designed and very functional camera bag.
top of the line brand name and a well designed back pack for all of your equipment, well designed for placementTo get to the lenses, which fills the bottom half of the bag, you unzip through the part of the bag which touches your back, thus providing security from the outside as well as extra padding. To get out the lens you need to remove the backpack and open it up from the where the bag touches your back (did I say that already?)
Without the camera compartment, I could fit my 15" Macbook into the main compartment with plenty of room to spare.This is the perfect backback for day hikers and for the amateur photographer. I use it for work and study because it's perfect for all my essentials and won't break my back. I'm very happy with it.
With all these items in the bottom compartment it is a tight squeeze but it fits. I typically dont need all my lenses so ill carry my wide angle and the nex 6 with a lens on. Then I can have space for my beats over-ear headphones. The zippers on this bag are smooth and seem like great quality. There is a strap at the bottom of the bag that allows me to swivel the bag in front of me, open the back pouch and switch lenses.
Well made, thought out design, and not overly obnoxious as a camera bag means that it will be getting a lot of use.
Answer: It means 22 liter capicity