With the emergence of online platforms for (social) sharing, collaboration and backing up, mobile users generate ever-increasing amounts of digital data, such as documents, photos, and videos, which they upload while on the go. Cellular Internet connectivity (e.g., 3G/4G) enables mobile users to upload their data but drains the battery of their devices and overloads mobile service providers. Wi-Fi data offloading overcomes the aforementioned issues for delay-tolerant data. However, it comes at the cost of constrained mobility for users, as they are required to stay within a given area while the data is uploaded. The up-link of the broadband connection of the access point often constitutes a bottleneck and incurs waiting times of up to tens of minutes. In this paper, we advocate the exploitation of the storage capabilities of common devices located on the Wi-Fi access point's LAN, typically residential gateways, NAS units or set-top boxes, to decrease the waiting time. We propose <sc>Hoop</sc>, a system for offloading upload tasks onto such devices. <sc>Hoop</sc> operates seamlessly on <sc>http</sc>(<sc>s</sc>) <sc>post</sc> , which makes it highly generic and widely applicable; it also requires limited changes on the gateways and on the web servers and none to existing protocols or browsers. <sc>Hoop</sc> is secure and, in a typical setting, reduces the waiting time by up to a factor of 46. We analyze the security of <sc>Hoop</sc> and evaluate its performance by correlating mobility traces of users with the position of the Wi-Fi access points of a leading community network (i.e., FON) that relies on major national ISPs. We show that, in practice, <sc>Hoop</sc> drastically decreases the delay between the time the photo is taken and the time it is uploaded, compared to regular Wi-Fi data offloading. We also demonstrate the practicality of <sc>Hoop</sc> by implementing it on a wireless router.