If you would prefer to avoid a bag you could get a vest from ScotteVest. I've got a lightweight vest and a hoodie (they've got more than just vests). The numerous pockets are largely hidden, but depending on the vest you can carry a large iPad in an inside pocket. Also, one of the side hand pockets can hold a water bottle. You can carry a lot and people can't tell you've got so much stuff in your vest. If you are patient you might get a coupons/promo code for up to 40% off. The vest seems durable; I've used mine for about 7 years.
If you would prefer to avoid a bag you could get a vest from ScotteVest. I've got a lightweight vest and a hoodie (they've got more than just vests). The numerous pockets are largely hidden, but depending on the vest you can carry a large iPad in an inside pocket. Also, one of the side hand pockets can hold a water bottle. You can carry a lot and people can't tell you've got so much stuff in your vest. If you are patient you might get a coupons/promo code for up to 40% off. The vest seems durable; I've used mine for about 7 years.