How comfortable is the money belt against the skin?

I LOVED IT...It is very comfortable... and well worth the money..

If you wear it inside your clothes wouldnt people see that there is a bump were it is?

Depends on 1) what you put In it and 2) how tight/baggy your clothes are

Can you fit a US passport into the main compartment in an upright position?

Hi, The outside size for our belt is length: 10.2 and width: 5.2, may you help check this size with your passport size to see if fit in upright position.

Will this fit an iPhone XR and 3 US Passports?

Dear Customer, Yes, our belt can fit an iPhone XR For you wanna fit passport, we recommend the other belt in our store. Here is the link:https://www.amazon.com/Money-Belt-Blocking-Comfortable-Grey/dp/B07F81T1JP/ref=sr_1_7?m=AANL94VLZ2PBD&marketplaceID=ATVPDKIKX0DER&qid=1562566389&s=merchant-items&sr=1-7