i think u r doing far too much for them. get them involved in all this and teach early on the responsibility for their stuff [disclaimer: i am not a parent]
i knw this from my mom who did everything and v grew up quite selfish and once v saw how hard she worked v realised that v needed to take care of mom too.
we had no idea how much our mom did for us so i think its good to let your kids c what you do and help out especialy with things like school bags.