Happy to share that, after multiple rounds of feedback, here is the set of rationality-themed T-shirts and bags with the slogan that got most support from the community, "The Difference Between Medicine and Poison is Dosage."

These t-shirts and bags are an effort to update based on the feedback received on the original set of rationality shirts and optimizing suggestions. This includes use of graphic images in the words, use of more professional designers, etc. We went back to the drawing board, and tried to design a new shirt that used a slogan that was quite popular. We ran the design by the Less Wrong FB group a couple of times (1, 2) and this is the final product.

As you can see, there are two styles available, one with "Dosage" empty and with the image of the dropper, and one with "Dosage" filled in and without the dropper. Various colors, sizes, and materials are available for each shirt/bag.

The first style is available for purchase on CafePress here.

The second style is available for purchase on CafePress here.

Look forward to hearing about your experience and thoughts about these t-shirts and bags, and the impact they make in carrying good rationality-themed memes into the world! We will be making more shirts and running them by the community as we did with these. All revenue will go into promoting rational thinking strategies to a broad audience.

Thanks again for all the feedback on the first set of Rationality slogan t-shirts, which Intentional Insights developed as part of our  broader project of promoting rationality to a wide audience. As a reminder, the t-shirts are meant for aspiring rationalists to show their affiliation with rationality, to remind themselves and other aspiring rationalists to improve, and to spread positive memes broadly. All profits go to promoting rationality widely.

For the first set, we went with a clear and minimal style that conveyed the messages clearly and had an institutional affiliation, based on the advice Less Wrongers gave earlier. While some liked and bought these, plenty wanted something more stylish and designed. As an aspiring rationalist, I am glad to update my beliefs. So we are going back to the drawing board, and trying to design something more stylish.

Now, we are facing the limitation of working with a print on demand service. We need to go with POD as we can't afford to buy shirts and then sell them, it would cost way too much to do so. We decided on CafePress as the most popular and well-known service with the most variety of options. It does limit our ability to design things, though.

So for the next step, we got some aspiring rationalist volunteers for Intentional Insights to find a number of t-shirt designs they liked, and we will create t-shirts that use designs of that style, but with rationality slogans. I'd like to poll fellow Less Wrongers for which designs they like most among the ones found by our volunteers. I will list links below associated with numbers, and in comments, please indicate the t-shirt numbers that you liked best, so that we can make those. Also please link to other shirts you like, or make any other comments on t-shirt designs and styles.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17

Thanks all for collaborating on optimizing rationality t-shirts!