Bellroy describes the attachments as "self-compressing gussets" that adjust to your load, and paired with the crumpling design, it means that the bag has a lower profile when not heavily laden, making it better suited to everyday use
Plus, I found that I could make outsized Pikies that would still swim effectively
And if youve had a particuarly fruitful trip, fish for supper is a must
Its a solid, no-frills option for everyday adventures
That said, all else equal, I like the even smaller hook in the Itty Bit heads for an all-species approach Double Trouble Most frequently, when I want extra weight, I use a tandem rig, figuring the added weight might as well be gained with an extra option for the fish and greater visibility, along with the possibility of catching doubles (which happens a lot, some days)