The plastic pockets are excellent for valve oil/slide grease as I have had problems with leaking bottles in the past, and nobody likes having valve oil all over their stuff

The other pocket works well for mutes and other items

The other pocket works well for mutes and other items

If you are hoping to carry, for example, a B flat, a C, and a flugelhorn, it might not work as well

If you are hoping to carry, for example, a B flat, a C, and a flugelhorn, it might not work as well