"El silbato está en mi mochila."
Translation:The whistle is in my backpack.
Well. rucksack should be accepted - and indeed is on another question!
Rucksack not commonly used in the USA. I think they loaded an American dictionary into the program when DL was set up.
Here in Colombia they the word 'bag' is also translated as mochila not just backpack, I don't know if it is the same in the rest of Latin America.
Why wasn't rucksack accepted? DL says here that rucksack is a variation of mochila...
19/5/14 - So annoying that it still isn't accepted - I hope you reported it
for clarity of location use 'sobre' for 'on' and 'en' for 'in', use 'en' for 'on' for dates etc. ex: en la 4 de julio; on the 4th of July.