Ziploc Vacuum Bags Chicken Storage...okay To Keep Chicken Breasts In The Refrigerator Without Original Packaging?

Chicken storage...okay to keep chicken breasts in the refrigerator without original packaging? - ziploc vacuum bags

I bought about 5 pounds of fractions of chicken breast, and the expiration date is 31 July. Right now I cook 2 pounds of him, and put the rest in the refrigerator, but put them into a Ziploc bag, do not keep the original packaging. Since the chickens are no longer a vacuum, it is normal that they have in the refrigerator until 31?