Which Customized Product is good to boost my business?

As such there is no clear answer which product is good to promote your business? There are various factors which can decide  best one for you like need, budget , size and the event.

You might have to consider the imprint area . On larger imprint area, the print area will be big. Water bottle , drawstring bags, tote bags, umbrella have large area.

Also might have to see, if those are durable or not. 

If you need suggestion, you can always contact allpromoitems.