MYSQL Combing Two tables From Multiple Row

I have two tables, one is for all products, the other is for new purchases products.

Product Table

Item    Qty
301       2
302       5
303       3
304       4
305       6

Purchases Table

Item     Qty    Status    Date
302       5     used      09-15-2015
303       5     reserve   09-20-2015
301       5     used      09-20-2015
302       5     reserve   09-20-2015
304       5     used      10-15-2015
303       5     reserve   10-15-2015

I want to display how many quantity in the product table, and join the quantity of purchases table to Product Table

This is my initial sql query

SELECT product_name, product_quantity, quantity 
FROM products 
    LEFT OUTER JOIN purchases ON products.ID = purchases.product_ID 
WHERE product_status !='deleted' AND status != 'used'`. 

However, it only returned the the items from purchases table that is reserve.

what I want to achieve is

Item    Qty    Reserved Qty    Total
301       2     0                 2
302       5     5                 10
303       3     10                13
304       4     0                 4
305       6     0                 6

UPDATE New sql query

SELECT product_name, product_quantity, p.quantity 
FROM products 
    LEFT OUTER JOIN (SELECT * FROM purchases 
        WHERE status = 'reserved' 
        GROUP BY product_ID) AS  p ON p.product_ID = products.ID 
WHERE products.product_status !='deleted'`

But it returns 0 on reserved qty.