Sprint Top Box Advice

Kappa and Givi unless you want to go for a Triumph one. Not sure if Triumph did one for that bike.
I put a Kappa 48L on my bike with the universal plate.
Does the job for me. My bike is a Thunderbird btw.

 

It sort of depends what you want out if it. Do you want it to hold a helmet or indeed two helmets. Will they be full face or not. Do you want it to have a passenger back rest. Does it need to have matching panniers.

Givi do a number of options. But you need to add a Givi plate to your triumph rack.

 

It is I can get my flip front and the other halfs full face in. Surprisingly enough her full face is larger than my flip.
Her head is way smaller than mine. Sits back and waits for the usual banter Popcorn any one ?
Kappa 48L Top Box http://www.ebay.co.uk/itm/KAPPA-K48...552611?hash=item540c5b24a3:g:v4IAAMXQVT9SuIyq
This is where I got it ( see above ). I needed a universal fitting plate to fit it to the rack on the Thunderbird ( Givi one. Kappa and Givi use the same fitting system).
Kappa boxes fit on Givi fitting systems. Just make sure you order the right monokey or mono lock fitting plate.

 

www.squaredeals-ltd.co.uk have a 42 litre top box and base plate for £49.99 if that is any good for you. It's in the 'clearance & discontinued' section.
Probably not quite as good as Givi/Kappa, but much cheapness!!

 

Welcome to the madhouse Buckers - you can see why!