Which would you start first: the big shampoo bottle or the smaller one?

and why?Which would you start first: the big shampoo bottle or the smaller one?
the big one, I use the smaller ones for traveling to take up less space in my suitcase. I try to pack as light as I can.Which would you start first: the big shampoo bottle or the smaller one?
The smaller one. I dunno just seems right
the smaller one cos you would go through it quicker to get rid of it to keep room for the big one
I use the smaller one first! I use the big bottle to keep filling the smaller bottle up every time I run out!
The smaller one. The large one will take longer to use, thus having the space for shampoo bottles congested longer than if I used up the smaller one first, emptying its space.