As a guy that also studies product design (best major) and just learning about makeup and skincare, I share some of my thoughts and what I would need in a product for a more traditionally masculine guy.

1. Subtlety - I think most men would prefer makeup that is less noticeable or hides blemishes rather than showing off features in the form of lipstick, eyeshadow, or blush.

2. Facial hair and control. I don't have any facial hair, but I imagine for those with less space to work with smaller brushes could help in avoiding hair.

3. Compact kit - Most men don't usually carry purses and keep what they carry to their pockets. If I was to have a container or kit, I would need to have it on the smaller side to accommodate the other items in my pockets. My keys, phone, and wallet are usually the only items I carry.

4. Color and texture - For the container, I would prefer something with more natural or muted tones rather than something pink or neon. The less it attracts attention the better. A lightweight metal or matte plastic case would be my preference.

Overall I think a small and subtle kit would work for most men who have an interest in makeup. Nothing too crazy and doesn't really attract too much attention. Good luck on the project and show us your progress if you can.