How on earth do you think that you could do this?

Are you going to buy 100 of their items and bundle them with 100 of yours and sell them?

What NEW UPC number will you use?

Do you have permission from the other seller to sell their product?

Amazon has strict rules for bundles. Look them up so you don't end up suspended.

https://sellercentral.amazon.com/gp/help/help.html/?itemID=G200442350&ref_=xx_G200442350_a_r12_cont_sgsearch

Detailed bundle guidelines

Bundle listing and categorization:

• Bundles must consist of items that are highly complementary (this means items in the bundle enable or enhance the use of other items in the bundle or provide convenience to the buyer by purchasing them together) .

• Bundles consist of multiple single items that can each be identified by a unique ASIN/UPC and are sold together as a single offering. A pre-packaged kit or pack with multiple items that is identified by a single ASIN/UPC is not considered a bundle.

• A bundle may be listed in a single category only, even if the products comprising the bundle are from multiple categories. If a bundle includes products from multiple categories, it may be listed only in the category of the highest priced item in the bundle. The only exception to this guideline is if the highest priced item is BMVD or Video Games (because bundles may not be listed in these categories). In these cases, the bundle should be listed in the category with the second highest prices item that is not BMVD or Video Games.

• The bundle must have its own standard product identifier or manufacturer part number. The identifier of any individual product in the bundle may not serve as the identifier for the bundle. Using a UPC from any single product in the bundle to identify the entire bundle may lead to immediate removal of the listing. You are responsible for obtaining a UPC for each bundle you create.

• Do not include generic products in a bundle, as it may mislead customers into thinking the generic product belongs to the same brand as one of the branded products in the bundle. Generic products are identified as items with no brand whatsoever on the product or packaging (not just widely unrecognized brands).

• A bundle can be composed of different branded items, however the bundle itself should be branded according to the highest priced item in the bundle.

• If an item is a multi-pack, such as six pairs of socks, list it as a single product and not as a bundle. See UPCs and Item Package Quantity for Multi-Packs.

• If an item is a variation of a parent product, list it as a variation within the parent product’s family and not as a bundle. See Creating parent-child variation relationships.

• If you match your bundle to an existing bundle listing, the products in your bundle must be exactly the same as the products in the existing bundle in every respect. If your bundle is different in any way, you must create a new bundle listing. You may not change the existing listing to align to the specifications of your new bundle.

• Once you create a bundle, you may not modify the components of that bundle. If you want to add or remove products from the bundle, you must create a new bundle listing with a unique UPC or match to an existing bundle listing that is identical to your revised bundle.