The 300mm fits together GeLi into precisely and sits not too loose.
The only drawback with the combination 300mm + Geli:
The rubber coating on the Geli prevents a smooth sliding in the lens in the quiver and it needs thanks to the braking effect of a bit of force.
Workaround: The Lens Case 5 is itself in a transparent plastic bag. Packed in this very bag and hits the 300mm including Geli wonderfully in the lens case, because now no longer slows down rubber on the inner lining.
By comparison, for the 70-200mm 2.8L IS and colleagues from the lens case 5 is too large.