Used this summer in home shower when our water heater went out and a new one was on back order. The 2.5-3 gal. bag is better for indoors because the smaller bag height is just right for gravity flow. The large 5 gal. bag must hang from a high location for gravity shower to stream properly. A tall outdoor tree branch would work, however this larger bag requires two people to hang it up if filled to capacity due to the heavy weight. 5 gal. is enough for two people to shower. Otherwise, fill to half capacity if you are alone. It heated to 116°F in 4 hours on a hot day in full sunlight! Had to add cool water to lower temp. a bit before showering. On cloudy days or for night showering, we just heated water on our stove and poured into the bag after mixing with cool water to achieve a warm shower temperature and avoid melting the plastic bag with boiling water. Terrific nozzle flow and great shower experience to cleanse the entire body well.For starters, this shower bag is HUGE, so you can haul a good bit of water wherever it is you’re needing it. My husband and I went tent camping over the weekend and this product was perfect for our site; We used the shower bag to spray our feet down, to wash and rinse dishes, and brush our teeth. We didn’t have to run to refill the bag a lot because it held so much water to begin with. We were very impressed by this shower bag. Very durable and well made.Best quality and biggest compared to others I’ve used.The bag is good and heavy duty. Both nozzles are pretty cheap but seem to work well. Only downside is when filling the bag the hose kinks at the spigot and doesn’t seem to bounce back to its original shape. After a lot of use I suspect it would break. Still good for $25 thoughWasn't what I expectedOverall a good product. Constructed well and tough. The attached shower head is better then others by alot. I will update my review after extensive use.This is a gravity shower. But the bag is so long and the volume is so large, I can’t imagine who is strong enough and tall enough to hoist this monster high enough for it to function decently. I guess you could design a pulley system over a very tall (10+ foot) high branch of something??? Either that or lay in the mud to shower? The shower heads are good.I needed one of these for my last camping trip and I'm sure glad I got this one. It's huge and holds lots of water as I like a nice real shower. It comes with 2 different nozzle attachments, so use the one you like best .I also dig the thermometer on the bag. It's not like you can change the temp, but it's cool to check it out b4 you get all wet.It comes with a handy carry bag for it and the assecories. Overall very pleased.It also is very sturdy with a thick handle that's strong enough to hold it hanging from a tree or post. If it's too heavy for you to lift when full of water, then just don't fill it all the way. I'm glad it's big and holds alot. The pocket is perfect too for holding your soap or scrub brush on a hook.