There isn’t one best bag for every situation—most photographers use different bags depending on how much gear they need.

From the answers, a common approach is:

• carry only the lenses you actually need for the day
• keep one lens mounted on the camera
• store extra lenses vertically in padded compartments
• use a smaller bag for walkaround shooting and a larger bag for travel or heavier kits

For everyday use, a sling or backpack-style camera bag works well, especially one with quick side access so you don’t have to put it on the ground to grab the camera. For travel, a larger padded case or carry-on-friendly backpack can protect more gear, but it will be heavier. Some photographers also keep a hard or aluminum case for situations where equipment might get knocked around.

If your current backpack is full, the simplest upgrade is either a larger modular camera backpack or adding a second smaller bag for lighter outings instead of trying to carry everything at once.