See me here.
For good reasons:
It's unhygienic. Unless it's a dedicated bag or you have them isolated in a separate compartment, packing dirty laundry alongside other carry-ons in your back causes cross-contamination. If your Karate class involves extensive physical contact with other Karate mates, it's not just your sweat, blood, and germs that you're carry home.
On the last point, a nicely packed Karategi can in fact, be a great opportunity to share your pride of the Karate lifestyle and showcase your club!
Stiffer Karategi (often cotton, usually above 10oz in weight) are harder to fold into a small bundle, but they can be compacted into an easy-to-carry bundle.
Thinner Karategi (often cotten-polyester, usually below 10oz in weight) on the other hand, can be packed smaller, but they have a tendency of unravelling if they're not secured the right way.
Here are how we packed our Karategi!
Let me know how you like it and Share with us how you pack your Karategi after training!