I reuse my foodsaver bags when possible and appropriate.
I use old-school twist tie storage bags as liners. You can buy them in gallon size, 100 count for $2. I place my food in one first and then into the foodsaver bag. Do not twist tie the baggie, just tuck in down close to the food item. The vacuum will remove all the air. I use fold-over sandwich bags for smaller uses.
By doing this, I save time and energy not having to wash the foodsaver bags and money by getting to re-use them. It also gives the item a bit more cushioning when getting banged up in the freezer.
This is great for bread, veggies, frozen cubes of cream, juices and broths. I’ve successfully done it with cooked as well as fresh meats too; just freeze the meat first in the inner bag and then place and vacuum in the foodsaver bag. When defrosting, remove from outer bag before letting it defrost in the fridge.