EXHIBIT 1

JOINT FILING AGREEMENT

This will confirm the agreement by and among all the undersigned that the Schedule 13G filed on or about this date and any amendments thereto with respect to the beneficial ownership by the undersigned of shares of Class A common stock, $0.01 par value per share, of Portillo’s Inc. is being filed on behalf of each of the undersigned in accordance with Rule 13d-1(k)(1). This agreement may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument.

Dated: February 14, 2022

BERKSHIRE PARTNERS HOLDINGS LLC
By:	/s/ Kenneth S. Bring
	Name:	Kenneth S. Bring
	Title:	Managing Director
BPSP, L.P.
By:	Berkshire Partners Holdings LLC,
	its general partner
By:	/s/ Kenneth S. Bring
	Name:	Kenneth S. Bring
	Title:	Managing Director
BERKSHIRE PARTNERS LLC
By:	BPSP, L.P.,
	its managing member
By:	Berkshire Partners Holdings LLC,
	its general partner
By:	/s/ Kenneth S. Bring
	Name:	Kenneth S. Bring
	Title:	Managing Director
BERKSHIRE FUND VIII, L.P.
By:	Eighth Berkshire Associates LLC,
	its general partner
By:	/s/ Kenneth S. Bring
	Name:	Kenneth S. Bring
	Title:	Managing Director

BERKSHIRE FUND VIII-A, L.P.
By:	Eighth Berkshire Associates LLC,
	its general partner
By:	/s/ Kenneth S. Bring
	Name:	Kenneth S. Bring
	Title:	Managing Director
BERKSHIRE INVESTORS III LLC
By:	/s/ Kenneth S. Bring
	Name:	Kenneth S. Bring
	Title:	Managing Director
BERKSHIRE INVESTORS IV LLC
By:	/s/ Kenneth S. Bring
	Name:	Kenneth S. Bring
	Title:	Managing Director