How to wear toolkits?

Apologies if this question has been asked previously, but I was unable to find it.

How do you wear a toolkit (e.g. a healer’s toolkit)? There is an option to wield it in 1 or two hands, but none to wear it.

I was thinking that by the rules it would be similar to the backpack. You can wear it (where it has negligible bulk) or you can hold it in a hand (there it would have bulk.).

The link above also mentions you can wear up to 2 bulk of toolkits in this manner. Or does that mean you basically have up to 1 per hand (i.e. 2 total)?

Thanks