This Klip It multi-compartment lunch box was £3.99 on the shelf at Sainsbury's Huddersfield Shorehead but went through the till at 10p!
I got the blue one - but pink ones also available - but these may not have the glitch.
capacity 1.4L 48oz
approx dimensions 15 x 15 x 10 cms
base compartment with 2 sections ideal for snacks etc, top compartment with lid for sandwiches and chiller pack etc