jrickards

I'd like to buy a front roll pack (bikepacking style) but to ensure that I can get as much in as possible, I was thinking that a compression sack would be best but then a compression sack inside a dry bag seems like a lot of packaging so I was wondering if there is such a thing as a waterproof compression sack (but, because I'm not going canoeing/kayaking, it doesn't have to be immersion waterproof, just rain proof).

The Sea to Summit eVent bag seems like it might fit the bill but I'm wondering if there might be any others.

10 Wheels

https://www.searchlock.com/search?q=...pression+sack+

fietsbob

Yea they do they will have a valve you open as you compress them . & shut it when compressed

there are also compression straps to go over dry bags.. squeeze them

water tight , roll closures are able to still let the air escape ..

mstateglfr 

Another StoS option.
Ultra-Sil ® Compression Dry Sack | Sea to Summit

alan s 

I fit two compression bags inside a dry bag with a Revelate Designs harness. Works great.

Tourist in MSN

I was looking for a compression sack about this size and shape, the waterproof aspect was not important to me but I decided to pay a little more for a waterproof one just in case I decide to use it for a kayak trip. Very happy with it after my last tour but I have not had an opportunity to test waterproofness since I use waterproof panniers.
eVent Sil Compression Drysack | Waterproof Stuff Sacks | Granite Gear
Granite Gear eVent® Sil Compression Dry Sack - 18L - Save 32%

Aushiker

Beat me to it

Aushiker

I have a Revelate Designs harness sitting in a box in the car (well I hope it is in the box which I just picked up from the Post Office) and will be doing something along your lines but will be using a Sea to Summit Air Stream Pumpsack as my bag.

I am curious as to which bag you are using and its size. It looks rather big in the photos, but I assume it is more bulk than weight.

Bicycle365

+1 On this , I use the same approach with excellent results

alan s 

The outer dry bag is 15 liters, and the two compression bags (Sea to Summit) are maybe 10 liters and slightly smaller than the dry bag in diameter when compressed. Not sure on the exact sizes. I went to the store and filled two compression bags and made sure they fit in the dry bag. It is a bit bulky looking, but they fit my sleeping bag and clothes, so there's a good amount of stuff in the bag that compresses well. If the the inner bags are compressed fully, they are hard to get in the dry bag, so they are about 90% compressed, which reduces the diameter slightly and allows them to slide in more easily. I'm able to carry three sets of cycling clothes and three sets of off bike clothes, some t-shirts, and other clothing items (jacket, arm warmers, etc.), reducing the need to do laundry. On a recent 10-day trip, I was able to wear mostly clean clothing the whole time only doing laundry once.

DeadGrandpa

https://www.bikeshophub.com/trailers...ve-p-2682.html

I bought this 13 liter dry bag along with my extrawheel trailer, and used straps to secure it to my trekking handlebars. It held my tent and sleeping bag, with a foil/bubble wrap windshield heat reflector around those two stuff sacks to give the combination some stability and cylindrical rigidity. I also slept on the heat shield.

Aushiker

Thanks Alan.

staehpj1

The Sea to Summit eVent ones are my favorites. They have worked pretty well for me. The eVent panel in the end works great and eliminates the need for a valve.

MAK

REI Garage (formally REI Outlet) has four sizes of ALPS Mountaineering compression dry bags at a good reduced price.

REI-Garage-Paddle-Dry Bags/Cases

Rob_E

I've used a Summit to Sea, 20 litre, eVent bag. It did the job. I originally used it for my tent and insulation, compressed it as much as possible, and put it in a pannier. When I used it on my handlebars, I found there wasn't much point in compressing it. The compression just made it shorter, and since it was already shorter than my bars, compressing it just made it more awkward to tie on. It was kind of big around, and interfered with my headlight, so I switched to the Revelate large handlebar bag, which doesn't hold as much, doesn't compress, but is a better size with better attachment. My preference is the Revelate bag with the the harness, but I've successfully used the eVent and Revelate with and without the harness.

eVent without harness:


eVent with harness:


Revelate with harness:


Don't seem to have any shots of using the Revelate without a harness.

I would say that a Summit to Sea bag is a more versatile bag overall, but when it comes to just using a handlebar roll, I don't find the compression that useful. I have considered getting a couple of compression sacks and compressing my gear before stuffing it in the Revelate bag, but I'm not sure that's necessary. Probably depends on the weather, and how much insulation I need to carry.