This silica gel canister is designed to be quick to print and light on materials. It's 50mm diameter and 60mm tall, sized to sit in the middle of common 1KG filament spools. It also fits nicely in the hub of this master spool.
The body comes in two flavors, one with holes along the sides and one without. Materials like ABS, PLA, and PETG should print fine with the holes, but fussy materials like nylon may need the no-holes variant.
Update 2019.03.24: The new v10 files have improved threads which are rounded to provide better clearance and eliminate the need for post-print cleanup. Earlier suggestions about scaling the cap no longer apply. The slots and holes are also a little smaller.
Taulman 3D Bridge Nylon