I loved the way you could fold it over when you are carrying a few items and then it expands when you need the extra space. The magnet clasp is invisible (hidden under the fabric) but is very strong.
The fabric is showerproof and I didn't get any marks on it whilst on multiple trips even though it was on a chair, on the ground and picked up with hot and sun tan lotioned covered hands.
The best thing was the ability to lock the zips and to attach it to poles, chairs..... well, anything immovable, really. This gives you peace of mind that your items are as safe as they can be.
This is to be my buy of the year.