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I make long C clamps using some hard plywood. You can do a lot of compression with these extra powerful clamps. It is very useful thanks to its long arms. It is also strong enough to break the board. After downloading the dimensions PDF and watching this video, you can easily make Extra Strong Long C clamps. Adjustable distance very useful.
Making Video :
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PDF Download : Extra Strong Long Reach C-Clamps
Did you see this ? GreenSaw G Clamps
I decided to make a bag of 2 layers and 3 boxes. I designed the box myself.

There are nice wood knobs in this my diy project. In this video I m making wooden knobs for use in subsequent projects. I did it using 18mm plywood but you can use differ