1 st class mail items are considered to be express domestic items. Their delivery time is 25-30% shorter than fixed delivery time of traditional letter correspondence.
Delivery speed of first class mail items compared to traditional ones is reduced due to new sorting process and logistics. According to it items are processed directly in post offices without passing sorting hubs and then delivered by air mail as traditional ones forwarded by combined method. 1st class mail items are transported in special envelopes/packets edged with yellow logotype indicating this service.
1st class mail items are collected in special mail boxes. Correspondence is collected much more often than from ordinary mail boxes.