The bag seems very well-made, it comes with cute knit cover that resembles a turtleneck sweater. The bottle capable of holding 2 liters of hot or cold water. You can use it to warm your tootsie on those frigid winter nights or use could use it on those sore muscles after a long day. It can be filled with either hot or cold water. You may also fill it with ice.
The cover makes it even better, because now you don't have to worry about it being to hot , the cover protects you from burns. The cover is washable, I just toss it in with my delcates.
The covere comes off and goes on with no problems.
The fill spout is designed like a funnel,wide and tall so there is nnot much room for spillage of water whether it is being filled from your tap or a kettle. I highly reccommend this product.