1 Item you'd choose...

[avgas]

The RG150 tool kit (with some modifications) saved my ass more that once when i had that little bike.
Could get it stripped on the side of the road in about 5 mins.

[Duc]

Puncture kit and a mini tool kit always but if only one of these....the puncture kit definitely.

A passing vehicle is more likely to have a tool but unlikely to have a puncture kit for a MC

[P38]

A 50cal Desert Eagle and two spare clips would come in handy somedays.

Unfortunately this choice seems to have been accidently left off the poll

However a puncture repair kit is a must as Murphy's Law states

You are never gonna need a puncture repair kit once there is one under the seat.

[klyong82]

I got my original tool-kit, some extra tools, puncture kit in my boot lid always. On rides I stuff my digi cam and a bottle of water all in there. Party time maybe a 6pack. Love the boot space in the blade.

[marioc]

Penthouse and some tissues..oh wait

[nodrog:Me]

a puncture repair kit. everthing else can be fixed with the standard toolkit, and a mobile phone.