Big Shampoo

I really enjoy this Big shampoo From Lush. I bought it because I was looking for a volumizing shampoo and this was a recommendation by a YouTuber (in fact a lot of the things I buy now are recommended by YouTubers). It keeps my hair clean for days and it actually is quite volumizing. I bought it on boxing day last year and I still have about half of the products left (I bought the 325g one).

The conditioner is nothing special, I wouldn't buy it again.

Do you guys have any recommendations for a good volumizing shampoo and conditioner?