Apidura

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.

Used this for over 5 years and just ordered a new one as my original pack is falling apart.

This is the lightest and most waterproof and feature rich pack I could find. I ride a 61cm commuter track bike (All City Thunderdome) so the xl fits well and provides an amazing amount of storage with such minimal weight. The main issue I had is that the main compartment zipper finally broke down and comes off track. I can still get it close with multiple attempts and some finesse, but it's aggravating and annoying. Apidura (in UK) after many back and forth emails was willing to repair, but at my shipping expense, which to the UK was like $60 and not worth it to me. Then recently the separator between the smaller side pocket and big pocket failed, as it's just welded on. That was the last straw for me so I coughed up another $135 (with this on clearance, otherwise woulda been $212) to hopefully get another 5 years or more'this time I will be more careful w that main zipper. Not the most attractive pack and I hate the yellow logo, but after 5+ years, haven't seen anything that beats this.