I'm not a huge fan of trap dipoles. They work well enough but with room for only a few antennas I prefer to get several more bands out of them. Nevertheless if you're happy with a couple of bands then one can be a good project. And there's no antenna couplers to twiddle, unless you operate near the edge of the antenna's bandwidth.
Anyway here's a video on one for 7 and 14 MHz to enjoy. I did it a few years ago but it continues to be popular.
PS: Many other antenna topics are covered in Hand-carried QRP Antennas. Available in electronic and paperback form (some countries) this well-reviewed book is a popular read amongst hams who go portable.
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