Here are a set of bags that I designed this winter (leaning heavily on existing designs) and finished production of recently. I used thin card stock to find the shape and dimensions. From there cutting templates and final assembly.
The seat bag can hold a tent, sleeping pad and some warm clothes and the rolltop makes it flexible for different sized loads. It stays fairly still while riding but on heavy cornering can list a bit from side to side. I think that a third retention point might be necessary.
The frame bag has two openings at different heights with a removable and padded baffle that can turn it into two compartments. It is large enough for a 48oz Nalgene, some bike tools and extra food. With water in a different bag it can fit a stove, pot, etc. I'm still not sure what the best use of the space it.
For the front I just used an off the shelf North Face Summit bag that is suspended from the handlebars and tensioned below by a small canti-boss rack. With some tent stakes giving it form is stays put pretty well.
Click through to the flickr for more process pictures. If you have any questions or are interested in the pattern feel free to ask.
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