A WW2 dated, British Army Lightweight Rrespirator Haversack.

This example has the original metal prongs to the reverse - which enables it to be attached to the 1937ptn webbing waistbelt.  Ideal as a replacement bag if you have one of the ex-European gas masks which all seem to come in gas mask bags that have their metal prongs missing.

Price:
Excellent condition - £5.99 each
Good, used condition - £3.99 each

P&P:

U.K:
£2.53 1st Class
£3.24 Recorded Delivery

Europe:
£3.85

USA, Canada, Australia & New Zealand:
Airmail - £5.44
Surface Mail - £3.24