A few people have put Polo washer bottles on.

Why spend the time and effort putting a smaller one on? :S not gonna save much weight is it?

I thought the 4.5 ltr was a bigger one ?? - I have never got 4.5 ltrs in to my washer bottle

What size is the polo bottle ?
 
I find that if i run out of water/windowwash on the motorway (and i do loads of motorway miles)
the best tactic is to get behing a big 40 ton lorry and bathe your windscreen in its spray for a few minutes. Wipe and overtake! No washer bottle required!
 
Checked mine today - from completely empty I can only just get 2.5 ltrs in to it.

Anyone know the part number of the larger bottle (4.5 ltr I think) ?

And a price if known ?

Cheers