Trying to decide on a backpack for DS 12mo. He loved being in the baby bjorn and I miss the ease of getting out and about when we want to go on walks without the pram. Looking for something fairly light-weight and not too bulky, something either DH or I could use without too much fiddly adjusting of sizes for us between uses. We'd be walking 3 hours max. Budget up to £100, less if poss. Be grateful for any recommendations. Have seen the Little life Ultralite and Cross country in Mothercare and like the look of these, but be very grateful for any recommendations. TIA.