Lost Bag near Southern Train from Brighton to Eastbourne, Brighton, United Kingdom

Lost a light grey/green grid-patterned Osprey backpack with grey sides and yellow trim/zipper pulls, containing camera equipment (Instax camera SQ1, micro digital camera lens), clothes, personal belongings, and a BACN 2026 conference badge on the Southern train from Brighton to Eastbourne (around carriage 3 or 4). Contact via DM.