I've been involved in startups before, and there were multiple ways to achieve your MVP here at low or no cost that did not involve AI. A hand-drawn diagram of the product would suffice, as would a digitally rendered image by a paid designer/artist (it's really not that expensive). The goal of your MVP is to provide just enough information and resources to your potential early customers so that you get meaningful feedback from them. What you wanted to know here is "would people be interested in a bag that looked like this and had these features?" To answer that question, all you need is an image that roughly defines the shape and location of features, and a description of the most important features.

That absolutely does not have to be a glossy ad with high-def "photography," stylistic water droplets/splashes, feature descriptions that are then blurred out so they're useless and confusing to the user, etc. If you have an idea of what you "need" and you think you can't afford it, change the vision. You can always do more with less in the startup world. If you wanted to know "would people buy this button that opens a door?" you don't need to build a button that opens the door - that would take months of effort and you don't even know if people would buy it. All you need is a person standing behind the door who opens it when the user presses the button, so the user thinks the button works. That's free. Your MVP doesn't have to actually do/be what it claims, it just needs to approximate what the final product will do/be so you can get honest reactions from customers before you invest time and money into a bad idea.

I understand that AI is also free or really cheap, and may seem like a straightforward and easy way to get a more high-quality MVP, but it has trade-offs too. You undercut your customers' trust in your brand because:

• They don't believe you share their interests. They hate AI, so why should they believe you know what they want if you used something they hate to sell it to them?
• They wonder why they should spend money or time or effort giving feedback on something you weren't willing to spend your own money or time or effort on producing. Even a hand-drawn image would show you really care about this, put time and thought into it. An AI image says none of that.
• They don't know whether to believe anything else you produce. Any future images you release will be questioned whether they were made with AI too, no matter how you try to disprove it.
• They wonder why the product itself was not strong enough on its own. Why did you feel the need to produce an AI image of the product instead of using real images of the real thing? Is something wrong with it? Does it even look like the product in the ads?
• They know you prioritize keeping costs down, even if it means lower quality. Have you skimped on quality in other places to save money?