ARM Cotex-M0 memory allocation for structure array with bitfeilds

I want to use a structure as given below on my ARM Cortex-M0, I am using C programming.

struct path_table_t {

uint8_t lut_index;

uint8_t flag : 1; };

'flag' field is made to be single bit by bit fields.How will be the memory allocation for the array of above mentioned structure will happen.

Will I get the benefit of bit fields as saving in total memory

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