A belt dimension is not a phone-pocket dimension
Use the Ultra Belt's published outside dimensions as an identification detail, then ask a separate question about your cased phone and the pocket opening.
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Ask about the pocket you will use
A running belt can be large enough overall and still have a phone pocket that does not suit your cased phone. Start with the item you actually intend to carry, including the case and any attached grip. Then identify the exact pocket in the belt listing. A general statement that a belt has phone storage does not tell you the dimensions of its opening, how the zip closes around a case or whether another packed item reduces the available space.
CamelBak AU Ultra Belt specifications ?
Read the published dimensions literally
CamelBak Australia's Ultra Belt page lists dimensions of 12 cm by 34 cm by 6 cm and describes a zipped phone pocket. The page does not identify those overall measurements as the internal dimensions of that pocket. Keep them in the product-identification row of your comparison rather than drawing a phone-shaped template from them. The listed size choices also need to be kept separate from pocket capacity; a body-fit size name is not a measurement of the space available for a particular device.
Measure the complete phone shape
Record the height, width and thickness of the phone with its case fitted. Include a protruding camera surround or attached grip if it changes the shape that must pass through the opening. State your units clearly when asking the seller to compare them with the usable pocket. Do not assume that a flexible fabric can stretch safely to any required shape, or that a device fitting inside an empty pocket means the zip can close without pressure when the belt is worn.
Consider the access path
An internal compartment and its opening can have different limits. Ask whether the phone can be inserted and removed through the actual zip opening, and whether the proposed fit has been confirmed for the same case and belt variant. The archive running-belt and waist-bag photographs illustrate different pocket arrangements; neither is the Ultra Belt or evidence that your phone fits it. A photo can help formulate a question about access, but it cannot replace dimensions or an appropriate hands-on check.
Keep the rest of the load visible
The Ultra Belt page also describes flask and other gear storage. If those compartments interact, a phone check made with the rest of the belt empty may not answer the packed-use question. List the other items you expect to carry and ask about the intended configuration. The rigid bottle pictured here is not the Quick Stow flask; its caption makes that distinction because container shape matters. This guide does not prescribe fluid quantities or certify comfort during movement.
Decide from a documented answer
Before ordering, keep the exact belt variant, cased-phone dimensions and seller's response together. If the usable opening or internal space remains unknown, leave compatibility unconfirmed rather than treating the outside dimensions as proof. Review the seller's current return conditions before attempting a fit check after delivery. The practical outcome is a precise compatibility enquiry that can be answered or tested, not a blanket promise that every phone fits because the product page includes the words phone pocket.
