For which state are your questions directed...? You might want to post this question in the actual state forum.
*In Montana backpacks, duffel bags, purse, fanny pack - the weapon can be loaded and you are legal to carry.
*In Washington State if you are hiking, fishing or in some lawful outdoor activity you could conceal in a backpack or about your person.
*In Arizona, Alaska, Vermont no license is needed.
As you can see it varies by states