Initialize bit variable when using (bdata + sbit) ?

I have one question about bit variable initialization.

Before I used below simple way to initialize bit vars:

Ex.
bit bvar_0=0;bit bvar_1=1;
bit bvar_2=1;bit bvar_3=1;
bit bvar_4=1;bit bvar_5=1;
bit bvar_6=0;bit bvar_7=0;

And then ?C_INITSEG SEGMENT generated and gets bigger in size...

But when using (bdata+sbit) to declare above bit vars:

UINT8 bdata var2A       _at_ 0x2A;
sbit            bvar0= var2A^0;
sbit            bvar1= var2A^1;
sbit            bvar2= var2A^2;
sbit            bvar3= var2A^3;
sbit            bvar4= var2A^4;
sbit            bvar5= var2A^5;
sbit            bvar6= var2A^6;
sbit            bvar7= var2A^7;

I found ?C_INITSEG's size is changed(smaller) and I guess it was due to "not initialization bit variables"

Thus my question is: How to initialize these bit variables if using (bdata+sbit) ?