This is an Eldoreso Transport Rucksack. I've used it about twice in the past, but I've taken good care of it, so it's hardly been used. It has incredible storage capacity, so I think it can easily handle a 3-4 night trip. It has three main compartments, one of which includes a removable attachment (see photo). In addition, there's a front pocket that can store pens, wallets, etc. The shoulder harness can also store bottles and flasks, and the storage capacity is truly amazing. For runners who are traveling during the upcoming marathon season, this bag can hold almost everything you need, so it will be very useful. Of course, you can also use it for travel other than marathons. This product is often sold out in stores, so if you were looking for a deal compared to the regular price, please consider it. Approximate size (measured by an amateur, so please allow for some error) Height: 54cm~ Width: 36cm~ Depth: 15cm~ Measured without anything inside, so it will actually be larger when in use.