How best to store a matteress long term

My artisan bespoke matteress is having to go into storage whilst I travel for a year. It will be a very dry container so I have no concerns over environmental issues. If I placed the matteress back on the bed base (asuming I have the space) could I store items on top of it? A few lightweight boxes or the coffee table for example? ow long would it take for the matteress to settle back when I bring it out of storage, if it had been on it's side for example? Out of everything in my home my priority concern is how best to care for my lovely matteress. Please advise. Thank you.