The Mackinaw is the Exhumer with the largest ore hold, though it lacks in tank when compared to the Skiff. The Mackinaw will be a target in every type of space in EVE, making the Skiff the recommended Exhumer to use to avoid being a target for ganks.
The exhumer is the second generation of mining vessels created by ORE. Exhumers, like their mining barge cousins, were each created to excel at a specific function, the Mackinaw's being storage. Although it only has space to fit two mining or ice harvesting modules, a fast loading system allows them to do the work of three modules.
Exhumers are equipped with electronic subsystems specifically designed to accommodate Strip Mining and Ice Harvesting modules.
Mining Barge Skill Bonuses (Per Skill Level):
5% bonus to ship ore hold capacity
2% reduction in Strip Miner and Ice Harvester duration
Exumers Skill Bonuses (Per Skill Level):
4% bonus to all shield resistances
2% reduction in Strip Miner and Ice Harvester duration
Exchange Tank/Damage for local rats.
[Mackinaw, T1 Miner] Mining Laser Upgrade II Mining Laser Upgrade II IFFA Compact Damage Control Multispectrum Shield Hardener II Multispectrum Shield Hardener II ML-3 Scoped Survey Scanner [Empty Med slot] Strip Miner I Strip Miner I Medium Core Defense Field Extender I Medium Core Defense Field Extender I Infiltrator II x5
Basically a less tanky skiff. You only really gain a larger ore hold in this.