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I have this wonderful Ortlieb backpack, but it has no inner compartments. Most of the times when I'm looking for my keys or my wallet, I am digging in the backpack, which is quite annoying. Another thing I don't like about this, is that whenever I want to put my laptop in the bag, I more or less have to empty the bag first, because otherwise all the stuff inside is blocking the way.
To solve these problems, I made two inner compartments, one for my laptop, and one for other stuff. The compartments can be attached to each other and to the backpack.
Step 1Preparations
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First, remove the inner back side of the back pack by unscrewing all the screws you can see on the (outer) back side. Take out the inner back side. To make the compartments more sturdy, I used plastic place mats (one for each), which I sewed in the compartments. Use the inner back side of the backpack to cut the place mats in the right size. I made a little drawing for the pieces of fabric I needed for the compartment.