Hello Everyone.
I am looking for a rather large bag to go behind my seat, and attach to the seat. I have a new one that is too small to hold my basic survival tools, and my cellphone, wallet and keys.

My basic tools are a Crank Bros. tool, a tube, tire irons, and 2 CO2 cartridges and applicator for inflating tires. with this set up, my wallet and keys cause the bag to be packed full. My cell phone will not fit no matter what, it is just too long with the antennea. I looked at Nashbar, but their biggest bag seemed a little small. My LBS only has the smaller type seat bags.

I have the Topeak Large Wedge Seat Pak for when I really want to carry a bunch of stuff (not often). It's expandable too and includes a waterproof cover that stows neatly in a seperate little pouch. There's also bungee straps that can be used to secure things like a jacket. You can get an idea of the size of it from this picture of it mounted on my MTB.

For most normal rides, I use the smaller Small Wedge Seat Pak. It isn't expandable and is just big enough to hold my minitool and small bottle of sunscreen or my small mobile phone. It does have bungee straps on the bottom which I use to secure a spare tube. Here's a picture of it attached to the saddle of my roadbike

They have a medium sized one too. Also you can get them in "aero" versions. I like them because they're easy to mount and dismount, don't shift around, can carry just the right amount of stuff and they're plenty sturdy.

JanDD makes a huge one which I have on both my bikes.

Thanks Khuon,

Denver, would you have a pic, or a link? I'd like to order one if I can. Thanks.

I checked their website:

www.jandd.com

and did not see that particular one. They did have some other large ones, though.

Sorry, perhaps it has bee discontinued!!

Just found this on performancebike.com

It is pretty close:

https://www.performancebike.com/shop/...e.cfm?SKU=3549

Also check out the headland large seat bag
https://www.headlandbike.com/bags/cmt/cmt.htm# It measures 8"x4"x3.5" I have one when I take my son on his tag-a-long bike so ahve two tubes, Co2 pump, 4 Co2 cartridges, wallet and minitool and 15mm wrench for his wheel. It is built very well and holds on very securely.

You could try reducing your load. Example: why take a wallet? When all you really need from your wallet is your ID and some cash. The Jandd Mountain Wedge looks a lot like the one I got made by Bike Pro that only cost $12 or $14 at my LBS.

I can stash a spare tire, tube in it's box, Park MTB mini tool, Leatherman Squirt, 2 tire irons, a Quik Stik (for fast removal of a tire, VAR (for hard to put on tires), minor first aid kit, AA bats for taillight and button bats for computer, 6 clueless patches, a tire boot, $21 cash, garage door opener, old drivers license and a phone card.

That's a lot of stuff crammed into a bag with only 175 cu in max of space. So, as you can tell, the Jandd should fit everything you have.

Here's is a very large seat pack that Jandd makes. I came across someone with this pack and she had everything in it including her jacket. Here's the direct link https://www.jandd.com/detail.asp?PRODUCT_ID=FMW3

If you want a BIG saddle bag, check Rivendell

https://www.rivbike.com/webalog/baggage_racks/

That is the one I have and couldn't find. Thanks. One of mine is red.

Carradice of Nelson, England makes the definitive saddlebags for bicycles. I put one of their Camper Longflaps on my Raleigh Twenty and carry anything that I can think of with room to spare. (I store my helmet in their too!) They make several sizes of bags, and you can't beat them for their whole sense of panache.

Good luck with whatever you choose.

Thanks for the good info everyone. Urban_Assault, aka Russ, has kindly offered to send me one for free, he is no longer using it. Is this a great forum or what? THANKS RUSS.