You can try these aforementioned sites, but as I know there are no such sites which provide free space without ads. Advantage of these are, that this doesn’t have waiting time, time limit, download speed limit. And for mediafire one can upload without creating an account. There is also a Chinese file hosting site called Baidu, which offers a whooping 1 TB of free storage space. The speed at which you can upload files to it is very slow though, so keep it in mind. It’s good for long-term storage of files you know you won’t soon need.