Sizes Sizes: S, M, and L Package Speedbag Integrated cockpit Choosing your size Order the speedbag size to match the harness size e.g. harness size M, speedbag size M. If unsure, seek advice from free-flight professionals. Flybubble offers the Flybubble MATCH service for expert help. Since sizes are highly adjustable, it's best to stick with the standard matching size of harness and speedbag for most cases. This is also beneficial for resale value. In rare instances where a pilot has a exceptionally unique physique, such as disproportionately long legs or an unusually short body, they may need to mix different sizes of harness and speedbag to find the right fit. Compatibility Compatible with LIGHTNESS 4 harness (only). Mounting To mount a new speedbag you have to remove the old one first. Proceed as follows: Warning!When replacing a speedbag, always use the speedbag lines belonging to the respective speedbag. Remove speedbag Detach the foot accelerator. Detach the suspension loops from the main carabiners. Open the zippers on both sides. Open the hook and loop on the bottom of the harness. Loosen the two lower gray speedbag lines that connect the speedbag to the harness. To do this, loosen the anchor stitch knot under the adjustment tube and release the gray line completely from the black tab on the edge of the seat shell. Installing the speedbag Pull the upper end of the gray speedbag line through the black loop at the edge of the seat shell. Form an anchor stitch with the upper loop of the leash and pull the lower, red sewn part of the leash through it. Tighten the anchor stitch behind the adjustment tube. Close the zippers that attach the speedbag to the harness. Attach the speedbag cover to the bottom of the harness. Fix the suspension loops in the main carabiners. Warning!It is mandatory to fix the suspension loops in the main carabiners otherwise the speedbag zippers will be damaged. Attach the foot accelerator as described in the manual.