This 25-litre daysack from Wynnster has a concave airflow back system, which does an excellent job of keeping you cool and dry, and the broad strip of padding at the base feels good against your lower back. The padded waist belt helps spread the load well, and the shoulder straps sit well on your shoulders, too. It’s a spacious pack with two large side pockets, but the lid pocket is very cramped compared to some. Like most of the concave packs, the load is held away from your back, but it still feels reasonably stable and doesn’t move around too much, even when moving fast. It’s made from very tough ripstop polyester that should take a few knocks.