The phrase "to have on" means to wear or put something on one's body. It can also refer to having an item with you, such as carrying a bag or wearing a piece of jewelry.
It's one of those item we didn't have on hand as first time parents, but certainly something to keep in the medicine cabinet. (mommasociety.com)
Other franchises, such as restaurants, hotels, and resorts, can cost hundreds of thousands of dollars — which is something most people do not have on hand. (commercialcapitaltraining.com)
I just don't see asset markets as having an on / off state — bubble or no bubble. (rba.gov.au)