We get it. There's not a lot of room in your seabag so you have to do a lot with a little. Meet the Ruck Pack Sled. Just strap in the weight, throw it on your back, and hike, climb stairs or do walking lunges. When you're ready for a different stimulus, drop it and drag it. Build muscle, burn fat, and get in great shape.

*Note: this pack is best suited to fit 150-200 lb athletes.