Apidura
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Recent Reviews
Good quality, closure is easy to use on the the fly. I use it on my gravel bike, stays secure on washboard etc. Have not evaluated for waterproof-ness. My only "negative" input would be that it is a little wider than some items in this category so you basically get more volume but the potential for it to brush your knees is higher. I use this when my l\Leadout-Racelite top tube bag is too small. The Apidura basically holds twice as much stuff as the Leadout (ie phone plus gels/food even a small jacket)
Not the cheapest out there but one of the lightest. The bags have a front opening that will allow cables to get through for chargers or other items. The straps are well made and wrap easily as well as hold even in rough terrain. Zippers are for the most part easy to open and close while riding but I wouldn't recommend that unless it's smooth pavement so nothing falls out. My only concern for the waterproof part of the bag is the front cable entry. It seems like it's just slightly too open depending on how water is splashing up on to the bike. I wasn't able to test this out but it's possible that anything you put in there you might want to be be able to get wet. Fabric is durable and cleans pretty easily with soap and water. If you have issues with bottle clearances I would recommend a bottle cage that shifts it down a bit and/or a side pull capable bottle cage.
It's not the cheapest bag out there by far but the materials and lightness make up for the higher cost. I compared this bag to a bag that was closer to the $40 mark on amazon and this was one was 200g lighter. That was significant enough for me to make the purchase. The bag packs well and has a vent that allows the air to escape when you roll it up which helps get things tight inside. I didn't have any issues with attachment or the velcro which is arranged in a way that doesn't rub the bibs. I wasn't able to test water proofness but overall it seems like the bag will seal out water really well.