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I've been thinking for awhile that having a bag on the inside of the frame of the bike would be a good place to store a few small things, such as a camelback bladder, shirt, etc. What I mean is a bag mounted where the yellow triangle is in this pic. For all I know, it's a common thing in bike shops, but I haven't been to one in a few years (unless you count Canadian Tire) and I've never seen anyone with something like it.

Would it be a good idea? Does it exist? If so, where could I get one?

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Any special needs? There are hundreds to be found in the internet. – Czechnology Apr 8 '11 at 18:35
@Czechnology Mostly just to carry a change of clothing in, or a camelbak bladder, without having to carry a backpack and get my back quite sweaty. Thanks for the link, quite helpful. – Tarka Apr 14 '11 at 21:16
I have made one at home with very good results. The only downside is that those bags destroy the painting very quickly (which might or not be an important problem). – heltonbiker Oct 24 '11 at 19:01
up vote 4 down vote accepted

There are many available. Here is one example:

Attaches to the seat tube and the top tube, providing a triangular storage space. This one also is padded to aid with portaging (if you have a big enough triangle).

I know some people who tour with home-made frame bags that take up the entire triangle.

These bags are a great idea because they keep your load close to your center of gravity.

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Went into a couple bike shops around here, and they're sold out at the moment, but should be getting some in soon. In the mean time, I picked up a small one to keep lights and a hat in. – Tarka Apr 14 '11 at 21:17
these bags are great for full-suspension bikes, too. – heltonbiker Oct 24 '11 at 19:01

Custom Frame Bags from Revelate Designs.

Custom made frame bags for your bike. Any size, any shape.

Bag gallery link

I haven't tested them (yet) but seems like a very good choice if you're looking for something durable!

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