Question about extracts

I go to music festivals occasionally, and like to sneak in kratom in caps. My problem is I have to take a lot of them, and it's tough to take enough to have any effects. At some point, I'm going to look like I'm sneaking in drugs for distribution or something.

I was wondering if it would be a good idea to buy some extracts and cap those so that I can get the full effects from less powder.

About how much extract would be the equivalent to 3g of regular kratom? What are the best vendors? Is it a bad idea?

Thanks