I'm going to answer your question, but I need to make a couple of assumptions. This is a good learning opportunity! As answerers, we don't want to make assumptions, it might mean we're not giving you the best answers. This will help you see the kind of details we need for your future questions.
I'm going to assume the magic tag is applicable here. If it isn't, I'll delete my answer.
I'm going to assume this works in your world's magic system.
I'm going to assume that alternate or parallel dimensions are not available to your world.
I am going to have a bit of fun couching this in a backstory that obviously has nothing at all to do with your own story. You're certainly welcome to any ideas this might give you!
I recommend portals
The Wizard Duormond created in the year 121 of the Antekin Uprising the Verdigris Bracers. Legend tells that they were created at the behest of the Potentate Ulquat who, having his greatest treasure, the Carab of Mynoah1 stolen, wanted a way to ensure a means of quickly taking posession of his greatest treasures.
The bracers were described by the historian Alfaecen as approximately five inches in length and six inches round, though always able to fit snugly to the forearm of any who bore them. Metalic in vision but supple to the touch, each had a dial on the inner-arm side about the size of a sand dollar and inlaid with five coloured gems. The bearer could touch the center of the dial and speak the word, Mechth! and the dial would rotate one position, always leaving one gem forward toward the thumb.
Alfaecen continues by explaining that the bracers were activiated by the intent of the bearer, but that intent had to be of strong will and need. With the right, the bearer would reach forward and a portal would open, permitting his hand entrance to the Chamber of Pyndrell. From the Chamber, the bearer would grab and draw forth whatever object had been joined with the bracer's gem. With the left the bearer could likewise take posession of another object, meaning ten objects in all were quickly available to the bearer. But, of great interest, is the apparent fact that the location of the portal is always before the hand. Thus, even if one's hand is behind one's back, the bearer could posesses that which is beyond the portal so long as a modest reach (the depth of the hand) is attainable.
Though the portal was never greater in size than the hand of the bearer, the captured item would always appear in its grandure when the closed fist grasping the object was pulled out of the portal, the portal would then close. The jester Yukedyc sings ballads of great warriors suddenly bearing ancestral swords and one, the Romance of Hasden and Leuonnia, tells of Hasden drawing roses from the air without number as he courts Leuonnia.
But, of the location of the Chamber of Pyndrell no one knows, though it is upon the land (Alfaecen assures us). It thus could be found by burglars or others with nefarious intent. Legends suggest it is also subject to the infrequent shaking of the ground, infusion of water, or other natural interference. Thus it requires periodic visits from the bearer to ensure items remain in place.2
Alfaecen continues by describing the Chamber: it is said to be no larger than a small room, with one entrance and space on the four walls for the ten items, whether leaned against the wall or set upon pedestals. Before each object stands a sconce bearing a dull, black stone and a coloured gem. Whether the gem was to the left of the dull, black stone or the right would determine which bracer would invoke the portal for that object. A brilliant diamond at the fore of the sconce identified the direction the portal would open, and thus had to point toward the object of desire.
Alas, Alfaecen concludes, the location of the Chamber has been lost to time. Bearers of the Verdigris Bracers can pull from the Chamber, and can place into the Chamber, through the portals — but the loss of the chamber itself has caused difficulty. It is known that the left bracer's ruby position now opens a portal into solid rock and the right bracer's lapis position no longer opens at all (it has been long speculated that the sconce must have fallen, disloging the stones). The floor cannot be seen through the portals and one can only imagine what wonders of treasure, might, and magic lay mere feet away from the bearer! Alas, unless discovered anew, none will ever know.
1 There is a possibility, suggested by the epic poem Fenningdyn that Ulquat really only wanted the ability to pet his cats when he wanted to, but a more legitimate claim can be made by the recently discovered journal of the burglar Jyk, who claims to have robbed Duormond of his belt whilst traveling through Laemis Vale, forcing him to walk the remainder of his two-week journey to Ruddton holding his pants up for lack of a spare. Jyk was laywaying people in that area at the time, as attested by the Sheriff of Laemis, and the bracers were known to be upon Duormond's arms two weeks later, lending strong credence to Jyk's tale. But who can trust a burglar?
2 If you're asking yourself, "you mean he could open the portal and get hosed down with water? Why would you even do that?" it's because I'm a believer that good stories use weaknesses to their advantage. All-powerful characters or items, or perfect processes and actions, make stories boring to me. Weaknesses are something that can be used to comedic effect, or to engage a more complex story line (like, "I can't use it in the spring, the chamber's always full of water!"). So, I can't help myself. People, places and things can't be utopic in my world.