Terry, there are many storage unit places closer to the airport, but then of course you'd have to rent a car. DIA Self Storage, for example, is less than 10 miles away. You can google map Denver International Airport, then "search nearby" for "self storage units" if you think that's something you might want to do. http://www.coloradoselfstorage.com/
There are plenty of convenient places to store your luggage in Denver, from downtown to Lincoln street to Capitol Hill and Commons park. The cost is just US$6 per day, and check in time is just 3 minutes. So basically, in the same time it took to make that instant cup of Ramen before rushing to the airport, you can be in and out the door with no luggage to weigh you down.
Now that you’ve scored yourself some Denver luggage storage, the next thing on the list is finding things to do and places to explore. If it’s a Monday, a lot of the amazing indoor attractions and restaurants will be closed, but there is still plenty to do on any day of the week! See a concert at the Red Rock Amphitheatre, marvel at the beauty of the Cathedral of the Immaculate Conception or take a hike in the famous Rocky Mountains. You won’t regret it!
The storage lockers were a “pilot,” the kind of small test that city government frequently uses to test a new or controversial idea. The city offered up the lockers for individuals to use for months-long stretches. At the time, city officials warned that “misuse of the lockers, vandalism, or other unanticipated results,” could force them to cancel the project.
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