I need a knapsack weed sprayer are the cheap ones any good or do you need to spend a bit more, anyone bought one lately for advice?
I got one on sale for about $15 from Bunnings a bit over a year ago. Works perfectly well although there are a couple of little gotchas. The pump handle can come off quite easily which can be a nuisance when you're halfway through spraying. Probably easy(ish) to fix with a drill and split pin. The straps are a bit thin and can become uncomfortable and it can be a bit of a nuisance to put on. Otherwise it works fine and dandy.
I rekon you can't go past Solo. I've got one and Dad always used one. They are great.
From my experience, avoid the cheapest of the backpack sprayers - the bend of the pump handle introduces a weak point that breaks after a year or so usage.
The Solo sprayers don't have this problem, and feel a lot better made.
I bought the Solo Backpack Sprayer with Padded Straps 15L from the Warehouse it should suffice. Thanks for your help.