The main things which one has to take care when purchasing camera bags and case are avoid loose items, quick and easily approachable of camera equipments, length of space for camera lens gently, having a balance, affirm backpack coherency, and voidness of spills.
The main thing in camera bags and cases is to protect the gears, while keeping them in safe cushions. Often, what has been found that if you try to put gears more than the actual quantity or more loose items in the padded compartment of the gears certainly gears will be rubbed or bounced due to the loose items or the extra gears which is not good if you don't want to waste you expensive camera. Another important precaution about the camera case is that camera equipments would be accessible easily without wasting of time particularly if you are going to capture ongoing shoots or scenes. In this manner, photo backpack is a good for this purpose as the equipment has to be spread out in a flat layer where you have to see and grab it all on a one glimpse. Never prefer to those large and spacious bags which are not for one layer support for the camera equipments. Always try what thing you first need to be used that must be at the upper tier in the camera bag because if that one is in the next or in the bottom layer then you have to take away all the upper items which take pretty time and you loss the ongoing tasks which might had to capture.
Your camera case may or may not be with roomy space and length wise to place lenses of the camera as you know this is the most fragile item in the whole camera unit. Therefore, it would be better if you place camera lenses in separate cases which would be identical and fit for lenses to refrain them from any damage. More particularly, you not only have to protect lenses from any damage, but also much much care about dust free ambiance. The case for camera lens must be dust free or even water-proof then you are free from any stress or anxiety burden. Always remember, whenever you travel never attached the lens with camera, safe them in separate case. Try to use them before cleansing them with soft tissue to remove scratches and dust, if any. With the same precautionary advises, always try to not unbalance your camera bag or camera case otherwise it may cause to lead any pricey damage especially during the travel or where such markets may be not available for you to overcome any loss. One last thing to be considered forever that is such bags or cases for cameras are designed only to carry them not to put additional items whether they are necessary to be with you or not. Try to use another bag for such additional necessary items. You have to handle and manipulate all these things if you want to be amazed how much you quickly and efficiently perform the best outputs with such pretty and reliable preventative measures.