Very light - and seemingly durable
I use this to walk the 25 minute round trip to my local gym. The main compartment fits two bath towels (normal size), a change of winter clothes, 3 bottles of shower stuff, and a pair of trainers. There is still space for a winter jumper. The compartments on the outside I use for a litre water-bottle, and the top outside pocket is amply big enough for a padlock and probably a sandwich or two.