According to special provision 671, transport category 2 applies.
As of January 1st, 2019, this UN No. is no longer assigned a packing group in Table A of the RID. According to special provision 251, the purposes of completion of the transport document as set out in 5.4.1.1.1, the packing group shown on the document shall be the most stringent packing group assigned to any individual substance in the kit. Where the kit contains only dangerous goods to which no packing group is assigned, no packing group need be indicated on the dangerous goods transport document.
Therefore, no packing group has to be specified for this first aid kit.