I am designing a database for a game and the only option I can see a multiple table solution. Is there an option that I'm not seeing? I searched but could find a similar situation, if I missed it please let me know. In this game there are approx 14,000 items which have their own table. The players will want to build multiple collections of these items. The collections would generally range from 20 to 100 different items in varying quantities, but could have hundreds of different items. The problem comes with the storage of these collections. I can't create a collections tables with each row a collection because the number of fields varies so much. 
I only see two solutions:


Create a collections table with a BLOB data field and store the data as a JSON object.
Give each collection its own table with an item ID field and a quantity field. Create a collection list table with the user id and the corresponding table name. 


Is there a better option? If not, I am leaning toward option two so I can easily run statistic queries. Due to the number of tables that could exist would it benefit me to keep the collections in a database separate from my other tables?
You want to store an undefinied number of items in a list, for this you need a new table or cleaner two tables.

you already have the first table called items, each has an item_id.

Then one table holds all the references to the collections, so best case only a new collection_id for every of the collection.

And the important one is the MxN relation table between items and collections, let's call it collection_items, holding in each row one item_id and one collection_id.

If you want to have multiple same items in one collection, and only want to know how many, add a count field.

But if the relations need to be distinguishable, add a row for every relation and an extra collection_item_id.