Service the bike before you go etc.

Make life a little by converting the assortment of fastener types found on modern bikes to one sort - daft Torx bolts on BMW oilheads! I prefer Allen bolts myself. Added benefit is that you can replace them with stainless rather than the cheesy monkey metal that some are made of these days. Don't replace caliper & suspension bolts with stainless unless it's A4 grade or better, it's hard but brittle & can snap under load.

As said earlier, make a lists of the tools used when servicing the bike & of the torque settings against each operation.

A lot of what you take is determined by your mechanical skills - if you struggle to replace a brake lever, no point in taking tools to adjust the valve clearances. Practice before you go to gain familiarity, especailly with repairing punctures etc.

If not planning on carrying a manual, then a (colour?) copy of the bikes wiring diagram is a great idea, along with the above mentioned tool & torque lists, it takes up no space - keep in a waterproof pouch along with other vital docs.

For me, insulating tape, stainless lockwire, cable ties (ziplocks), spare fasteners & plastic film containers filled with grease etc. Bulbs, spare cables & levers also handy.

I've drawn up a list that I refer to before each trip & take from it what I need according to the bike I'm using, where I'm going & the duration (time & mileage) - let me know if you want a copy e-mailed to you?

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