I have two, an Apidura 9L, which is a roll type tube, which you can easily load – I use this for commuting as can easily take a roll of clothes to change into and can squash down to whatever size you need – it also has a clip for an extra level of storage (I use a dry bag inside it so when I get to work I can leave it on the bars and slide the contents out). I also have a smaller Lugit square bar bag, which I use more day to day as it has a top zip closure and they are all custom made so you can choose the colours – its much smaller so is better for gloves, lights, coffee, tools etc, rather than a bike packing style