We want a feature where each bundle has a weight limit (e.g. 10 lbs) with a corresponding fixed price (e.g. $100). Customers should be able to add products until they reach the bundle’s weight limit, with the frontend showing real-time updates for selected items, total weight, and remaining weight. Once the limit is reached, no more products can be added. Additionally, we should be able to create multiple tiers, and each tiers should have weight limit and fixed prices (for example: 10 lbs = $100, 15 lbs = $150, etc.).

This is exactly the feature you already have, we just need an additional field for weight, where the logic works based on the total weight instead of price, while the price itself remains fixed for each bundle.