TravelonAnti-Theft Classic Mini Shoulder Bag Sling Tote

Q: What is the purpose of the carabineer?

Travel on says that the purpose of the carabiner strap is so that you can loop the strap around a chair, etc, if you were out to eat in a crowded and/or an unfamiliar place--and you didn't want to have to hold your bag the entire time.

Q: Will this meet the size requirements for the Rijksmuseum which says max size A4?

Hello, Travelon here. You will need to check with the Museum. The Product Dimensions are: 9 x 10.5 x 1 inches. If you have any further questions, please feel free to reach out to us again. Travelon

Q: If an iPhone 6 plus will not fit into a pocket, will it fit into the main compartment?

I have the iPhone 6 (not plus) and it fit into all the pockets ... I'm absolutely sure that the iPhone 6 plus will fit in several of the main compartments. I carried my iPad mini in the main compartment.