I found that when I put the longer bits into holder designed for shorter bits that they would wobble and be unstable.

This a 1x2 Gridfinity hex bit holder for the long hex bits. The hex holes extend all the way down to the base of the holder. Holds 38 bits securely and without wobble.

Other gridfinity models:

• Gridfinity short hex bits 1x1x2
• Gridfinity short hex bits 1x2x2
• Gridfinity long hex bits 1x2x2

• Ikea Alex Gridfinity base slim (36cm) drawer