after much internet research, the choice is made: Fastpack 350 via amazon amazon: nothing to say, great, if not a little card problem but not serious bag I have stored inside very easily (lower part) - 1 canon 400D + 70/300 cannon mounted TV with PS - 1 cannon TV with 28/135 PS - 1 TV tokina with 12/24 PS - 1 430 ex flash - 1 mini foot - The battery charger and cable and there is still some space. the upper part remains available (volume equivalent to PARIS telephone directories forming 17/27/13 cm the back pocket easily accepts 1 or 2 for sweaters. the external thread for 1 bottle is tight and very vulnerable (risk of loss). all is not too heavy and seems suitable for daily hiking, next to my 2 mountain backpacks. quick access to the equipment is seen, and in addition, it is superb in red ...