Exped Fold Drybags use mid-weight fabric to balance durability with weight. Updated with an improved bottom providing more usable space but still keeping the roll top closure and fully taped seams they are the classic all purpose Drybag.
Exped says:
The waterproof and reliable classics in the storage category. Lightweight and waterproof packsacks with roll-top closure. Made of durable and pliable PU coated taffeta nylon with 10,000mm water column and fully taped seams for waterproof performance. Bright inner PU coating lights up the interior of the bags for excellent overview of contents. Quick release buckle and grab handle.
Exped's Fold Drybag Olive Drab Collection 4 Pack are essentially the 'standard' drybags. They are tougher than ultralight but still don't weigh very much. These are best used as general purpose drybags. You can pack these, throw them in your rucksack, pull them out at camp and not worry about them as they are really hard wearing.
The updated drybags still come in this 4 pack with four different sizes in the olive Drab colour. This is a popular design as it is much more subtle when you are out in the hill and around camp.