When looking for hiking sleeping bags, check the weight of the product first. Ideally, you will want to find something that says it is either a lightweight or ultra lightweight sleeping bag, because when you are packing for a hiking trip, you want to pack as light as possible. Also, you will want a product that doesn't take up a lot of room, preferably.
Also consider the time of year you will be camping in to know whether you will need something that is insulated, and look to see what temperature the manufacturer says the bag will keep you comfortable down to.