For doing field work are these bags great, but they have some caveats. They can carry more than the discs you need, as well as some accessories. And isnt this all you need for field work? Well actually no. When you carry this bag to your field work session you will need to carry it in the handles. This can be a bit heavy depending how long you need to walk. The reason for why you need to carry the bag like this is that when the bag i loaded fully it is quite heavy. So the small connection points for the shoulder strap have a tendency to come loose. That is all i have to say about the bag.