Recommendation for selling by weight without leaving the page

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I am wondering if it is possible to build a store where I can select quantity by weight and add to cart without leaving the filtered page. I would be selling in bulk but the values can be set. Below is an example of exactly what I want to be able to do. Here is the website if you want to see:

Tracking inventory and the weight in regards to delivery doesn't matter to me. I found someone recommending the Buy the measurement App but it has a monthly fee. Also, I haven't seen an example of this drop-down menu. 

I hope someone can guide me on what to search to make this possible. I would be very grateful. Thanks community! 

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