Wilderness Exchange is within walking distance of Union and they require you leave a bag with them when you go into the store, they may be willing to stash your bag for a few hours. No guarantee on that, but an option if you can't find anything else. They are only open 10am-6pm on Sundays, so you may have to wait around a bit or pick it up early depending on when you get there and will be leaving.
AIS Shelving Division handles high-quality locker systems designed for use in athletic facilities, schools, retail environments and other commercial, military, industrial and institutional applications. For the best selection (featuring steel, plastic, and laminate) and pricing of storage lockers, cabinets, chests, accessories, furniture, shelves, and locks call AIS today to speak with our knowledgeable staff.
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/
For longer term storage, there are many self storage units around the metro area. Not cheap, but then neither is paying extra baggage fees and lugging around extra stuff not needed for another leg of your trip, as it sounds like Terry might be doing. For example, I found "Downtown Denver Self Storage" with units starting at $45 a month. http://www.downtowndenverstorage.com/
Some schools in the United States have been reported to have abolished the use of lockers. Security concerns are cited as the reason for this, with the concern being that lockers may be used to store contraband items such as weapons or drugs or pornographic material.[1] There has been some controversy over in what circumstances school authorities or law-enforcement officials are permitted to search lockers, with or without informing the users, or with or without the users being present at the time of the search, and it has been considered a civil liberties issue, particularly in the U.S.
I am writing this review because the owner of Lugden, Mic, lost; "gave-away" my girlfriends suitcase when we were in Denver for a wedding the Sept. 15th, 2018 weekend.  I do NOT want anyone to deal with what we went through.  This seemed like a great idea to check our bags and walk around Denver for a few hours before having to catch the train to the airport, but after only checking our bag for an hour we went back by and my bag was sitting on the side of the van and her bag was completely gone! Again, out there for a wedding! She had shoes, jeweler, expensive purses and pictures of her and her deceased father that she takes everywhere with her to keep him close to her; but her bag was gone.  He had no system to track, had zero clue who he had given it and could not call any of the previous people that he had recently given their bags back to them.  He quickly ran off in side as I called to the police to get me his liability insurance policy and stated "Oh man I just remembered, her bag was really heavy right?  Some guy came by and said it was his bag and there were books in it so I let him take it."   WTF!!!!! How does someone take someone's checked bag and run off with it.  To make matters worse because we had a plane to catch I called his insurance company the following Monday and his "Insurance Representative" informed me that Lugged Inc has lapsed on their insurance and has zero liability coverage for instances like this.  
Perforated lockers are similar to the standard types of locker, but the door and walls are made largely or entirely of perforated steel, with hundreds of holes creating a strong mesh arranged in a diagonal pattern. This is used where good ventilation is required, or where, for security reasons, it is necessary that the contents can be examined visually while the doors are locked.
Locking options: various types of key locking or padlocking facility are available now. Key locking options include flush locks, cam locks, or locks incorporated into a rotating handle; padlocking facilities may be a simple hasp and staple, or else a padlocking hole may be included in a handle, often called a latchlock. More modern designs include keyless operation, either by coin deposit (which may or may not be returned when use of the locker terminates), or by using electronic keypads to enter passwords for later reopening the locker. Some older lockers used a drop-latch which was incorporated into the door handle, and slid up and down and could be padlocked at the bottom in the "down" position, but these are less used now. Three-point locking is not possible with this type of latch, because it needs to be operated by means of a latch that rotates rather than slides up and down; so this drop-latch is probably a less secure locking option, which may be why it is little used nowadays. Prefect Combination locks are very popular in school lockers used in the UK due to their ease of use and the time and cost saved in the removal of locker keys.
If you are paid through the fall semester, you must clean out your locker during finals week of the fall semester. If you are paid for fall and spring, you have to clean out your locker during finals week of the spring semester, but not during winter break between semesters. If you are paid through summer, you have to clean out your locker two weeks before school starts. Exception: If you renew your locker, you must clean your locker out by the end of the semester that you paid through, unless of course, it is through summer, and then you will need to clean out two weeks before the fall semester starts. 

Perforated lockers are similar to the standard types of locker, but the door and walls are made largely or entirely of perforated steel, with hundreds of holes creating a strong mesh arranged in a diagonal pattern. This is used where good ventilation is required, or where, for security reasons, it is necessary that the contents can be examined visually while the doors are locked.

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.
To use an Amazon Locker as your shipping destination, find a Locker and add it to your Amazon address book. Then, during checkout, select the Locker as your shipping address. Once your package has been delivered, we will email you a unique 6 digit code. Simply visit your selected Locker and enter the code on the Locker's touchscreen, then remove your package after the Locker's door opens. Learn more about picking up a package from an Amazon Locker here.

When it comes to adventurous living, Denver ranks as one of the most outdoorsy cities in the United States. Whether it’s hiking up mountains or skating down the winding mountain-roads in nearby Boulder, Denver is a great place to be outdoors and enjoy that adrenalin rush. So naturally, if you have a long stopover in Denver, or quite a bit of time on your hands before that big conference, you’ll need to find Denver luggage storage so you can make the best of it.
Just so you know I have tried to call and email and left multiple messages trying to find some middle-ground and give him an opportunity to make amends as I know how determinantal negative online reviews can be for a business but they have not returned a single call or email and know that we are back in FL and she has lost/had stolen many, many expensive and sentimental things we have no choice but to share our story so that know on hopefully ends up having a similar experience.  

Locker Denver

×