Buying chicken in bulk is great unless you're throwing away half to freezer burn. You can try to suck the air out with your mouth potentially introducing your bacteria or risking sucking up salmonella yourself. This is not advised.

Instead pack your bags, have a bowl or fill your kitchen sink with water. Dip the bag in the water, forcing air to rise to the top, and seal the bag once the air is 99% gone.

Doing this should help better preserve your foods. Additionally if planning to store things a long time you can add a 1/4 water inside the bag to further try and encourage air pockets to disperse. Venison, fish fillets, veggies. Deep freeze water trick makes thawing take longer though.