SerfasArk Expandable Half-Frame Bicycle Bag (Black)

I ride the sky-islands, Arizona high-scrub desert, where the wind is always blowing 15-mph in your face. I love my panniers but wanted to cut down on wind resistance for day rides; but I also love my water bottle cages, where I usually keep 32- and 24-oz insulated bottles of cold water and caffeinated electrolytes. With the frame bag fully extended, I sacrificed one braze-on, but even with that bottle stored in the frame bag, I had a net gain of almost 2-liter of additional stream-lined storage. And the small zip pocket opposite the main pouch is great for a pump, multi-tool, wallet, and backup light. The bag is well-made and the flexibility of the webbing strap placement is impressive. I've always been a rear-rack trunk and panniers rider who scoffed at the bike-packing bag craze. But I'm now convinced, with the proper bike frame, that sacrificing a bottle braze-on is a reasonable trade-off for frame storage. Only the next few thousand miles can test the bag's durability. I may not be a complete convert, but for now, I'm quite pleasantly surprised!

Great bag, great price. High quality. It’s not flimsy. Holds its shape well. Very adjustable. I have a medium frame gravel bike and it fit perfectly. If you have a large it should still fit just fine. It’s a good size.

Works great for all-day gravel bike adventuring. Replacing the top Velcro straps with laces will help keep it from sagging; thankfully the existing webbing on the top accommodates this.There may be better bags out there, but none that I’ve seen at this price.

Mounted to a medium size flat bar bike, the rear straps are too short to attach to the seat tube. Quality seems okay but probably for a small size frame. would be too short for a large for sure.

The media could not be loaded. Fits perfectly on my salsa 57 Journeyman. Had for a couple years so this is a long term review

It is worth the money if you use your bike for commuting. You can replace the straps with metal zip ties so that the bag can't be stolen. Easy access to your phone while biking. The expanding bottom means there is a lot of space. And straps on the front and back keep the bag swinging to the right and left, which has happened with me and other bags. I haven't tested the water resistance but, things have seemed to stay dry in the bag during heavy rains.

This is a great bag. It has numerous attachment points and 5 velcro straps are provided. It is very easy to move between bikes. quality appears excellent and it is quite roomy.

a bike tech recommend this to me. It's comparable to $150 designs and fits my gravel bike perfectly. You can unzip the bottom and expands to a full triangle. I've probably gone through 4 to find this. Merry Christmas consumers

Ya un año de uso (prácticamente diario), y la bolsa está como el primer día. ¡Productazo! Le queda perfecto a mi bicicleta urbana, ahí transporto teléfono, llaves, termo de café y candado....

Worked well for what it is. Some of the fixed in place connection straps were poorly placed.

Me.parece una gran aliada.... Mientras dure. Es espaciosa y se puede volver mas grande. Me cabe una chamarra extra y gruesa para esos climas adversos de invierno o verano. Tambien cabe mucha comida. La.compre justo para no preocuparme del espacio y llevar cosas extras en ruta, gravel o mtb. Me gusta que no estorba a la aerodinamica de las bicis y esta bien diseñada. Mi unica preocupacion es saber que tan impermeable o que tanto durara. La calidad la veo apenas al.limits. seguire informando